Revert of Add SkPngChunkReader. (patchset #9 id:160001 of https://codereview.chromium.org/1040453002/ )

Reason for revert:
Busted Chromium builds:

../../third_party/skia/src/ports/SkImageDecoder_empty.cpp:63:17: error: no type
named 'Peeker' in 'SkImageDecoder'
SkImageDecoder::Peeker* SkImageDecoder::setPeeker(Peeker*) {
~~~~~~~~~~~~~~~~^
../../third_party/skia/src/ports/SkImageDecoder_empty.cpp:63:51: error: unknown
type name 'Peeker'
SkImageDecoder::Peeker* SkImageDecoder::setPeeker(Peeker*) {

Original issue's description:
> Add SkPngChunkReader.
>
> This class allows a client of SkCodec to read chunks in the data
> stream that are not recognized by libpng. This is used by Android
> to specify ninepatch data.
>
> Taken from SkImageDecoder::Peeker. Modify the name of the class
> and its method to be more specific to their use. Make
> SkImageDecoder::Peeker a subclass of the new class, to help stage
> the change in Android.
>
> Add a test to verify that it works.
>
> BUG=skia:4574
> BUG=skia:3257
>
> Committed: https://skia.googlesource.com/skia/+/3389e00136188800b98ca69488c0418c374fd78b

TBR=djsollen@google.com,reed@google.com,msarett@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4574

Review URL: https://codereview.chromium.org/1472863003

1 files changed, 0 insertions, 45 deletions

diff --git a/include/core/SkPngChunkReader.h b/include/core/SkPngChunkReader.h
deleted file mode 100644
index f424dd8cfc..0000000000
--- a/include/core/SkPngChunkReader.h
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkPngChunkReader_DEFINED
-#define SkPngChunkReader_DEFINED
-
-#include "SkTypes.h"
-#include "SkRefCnt.h"
-
-/**
- *  SkPngChunkReader
- *
- *  Base class for optional callbacks to retrieve meta/chunk data out of a PNG
- *  encoded image as it is being decoded.
- *  Used by SkImageDecoder and SkCodec.
- */
-class SkPngChunkReader : public SkRefCnt {
-public:
-    /**
-     *  This will be called by the decoder when it sees an unknown chunk.
-     *
-     *  Use by SkCodec:
-     *  Depending on the location of the unknown chunks, this callback may be
-     *  called by
-     *      - the factory (NewFromStream/NewFromData)
-     *      - getPixels
-     *      - startScanlineDecode
-     *      - the first call to getScanlines/skipScanlines
-     *  The callback may be called from a different thread (e.g. if the SkCodec
-     *  is passed to another thread), and it may be called multiple times, if
-     *  the SkCodec is used multiple times.
-     *
-     *  @param tag Name for this type of chunk.
-     *  @param data Data to be interpreted by the subclass.
-     *  @param length Number of bytes of data in the chunk.
-     *  @return true to continue decoding, or false to indicate an error, which
-     *      will cause the decoder to not return the image.
-     */
-    virtual bool readChunk(const char tag[], const void* data, size_t length) = 0;
-};
-#endif // SkPngChunkReader_DEFINED