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diff --git a/third_party/protobuf/3.6.0/src/google/protobuf/implicit_weak_message.h b/third_party/protobuf/3.6.0/src/google/protobuf/implicit_weak_message.h
deleted file mode 100644
index 3279bd1777..0000000000
--- a/third_party/protobuf/3.6.0/src/google/protobuf/implicit_weak_message.h
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@@ -1,135 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc. All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef GOOGLE_PROTOBUF_IMPLICIT_WEAK_MESSAGE_H__
-#define GOOGLE_PROTOBUF_IMPLICIT_WEAK_MESSAGE_H__
-
-#include <google/protobuf/io/coded_stream.h>
-#include <google/protobuf/arena.h>
-#include <google/protobuf/message_lite.h>
-
-// This file is logically internal-only and should only be used by protobuf
-// generated code.
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-// An implementation of MessageLite that treats all data as unknown. This type
-// acts as a placeholder for an implicit weak field in the case where the true
-// message type does not get linked into the binary.
-class LIBPROTOBUF_EXPORT ImplicitWeakMessage : public MessageLite {
- public:
- ImplicitWeakMessage() : arena_(NULL) {}
- explicit ImplicitWeakMessage(Arena* arena) : arena_(arena) {}
-
- static const ImplicitWeakMessage* default_instance();
-
- string GetTypeName() const { return ""; }
-
- MessageLite* New() const { return new ImplicitWeakMessage; }
- MessageLite* New(Arena* arena) const {
- return Arena::CreateMessage<ImplicitWeakMessage>(arena);
- }
-
- Arena* GetArena() const { return arena_; }
-
- void Clear() { data_.clear(); }
-
- bool IsInitialized() const { return true; }
-
- void CheckTypeAndMergeFrom(const MessageLite& other) {
- data_.append(static_cast<const ImplicitWeakMessage&>(other).data_);
- }
-
- bool MergePartialFromCodedStream(io::CodedInputStream* input);
-
- size_t ByteSizeLong() const { return data_.size(); }
-
- void SerializeWithCachedSizes(io::CodedOutputStream* output) const {
- output->WriteString(data_);
- }
-
- int GetCachedSize() const { return static_cast<int>(data_.size()); }
-
- typedef void InternalArenaConstructable_;
-
- private:
- Arena* const arena_;
- string data_;
- GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ImplicitWeakMessage);
-};
-
-// A type handler for use with implicit weak repeated message fields.
-template <typename ImplicitWeakType>
-class ImplicitWeakTypeHandler {
- public:
- typedef ImplicitWeakType Type;
- typedef ::google::protobuf::MessageLite WeakType;
- static const bool Moveable = false;
-
- // With implicit weak fields, we need separate NewFromPrototype and
- // NewFromPrototypeWeak functions. The former is used when we want to create a
- // strong dependency on the message type, and it just delegates to the
- // GenericTypeHandler. The latter avoids creating a strong dependency, by
- // simply calling MessageLite::New.
- static inline ::google::protobuf::MessageLite* NewFromPrototype(
- const ::google::protobuf::MessageLite* prototype, ::google::protobuf::Arena* arena = NULL) {
- return prototype->New(arena);
- }
-
- static inline void Delete(::google::protobuf::MessageLite* value, Arena* arena) {
- if (arena == NULL) {
- delete value;
- }
- }
- static inline ::google::protobuf::Arena* GetArena(::google::protobuf::MessageLite* value) {
- return value->GetArena();
- }
- static inline void* GetMaybeArenaPointer(::google::protobuf::MessageLite* value) {
- return value->GetArena();
- }
- static inline void Clear(::google::protobuf::MessageLite* value) {
- value->Clear();
- }
- static void Merge(const ::google::protobuf::MessageLite& from,
- ::google::protobuf::MessageLite* to) {
- to->CheckTypeAndMergeFrom(from);
- }
- static inline size_t SpaceUsedLong(const Type& value) {
- return value.SpaceUsedLong();
- }
-};
-
-} // namespace internal
-} // namespace protobuf
-
-} // namespace google
-#endif // GOOGLE_PROTOBUF_IMPLICIT_WEAK_MESSAGE_H__