Fix "unsafe narrowing" warnings in absl, 8/n.

Addresses failures with the following, in some files:
-Wshorten-64-to-32
-Wimplicit-int-conversion
-Wsign-compare
-Wsign-conversion
-Wtautological-unsigned-zero-compare

(This specific CL focuses on .cc files in */internal/.)

Bug: chromium:1292951
PiperOrigin-RevId: 473868797
Change-Id: Ibe0b76e33f9e001d59862beaac54fb47bacd39b2

2 files changed, 3 insertions, 4 deletions

diff --git a/absl/flags/internal/flag.cc b/absl/flags/internal/flag.cc
index 55892d77..cc656f9d 100644
--- a/absl/flags/internal/flag.cc
+++ b/absl/flags/internal/flag.cc
@@ -406,7 +406,7 @@ template <typename StorageT>
 StorageT* FlagImpl::OffsetValue() const {
   char* p = reinterpret_cast<char*>(const_cast<FlagImpl*>(this));
   // The offset is deduced via Flag value type specific op_.
-  size_t offset = flags_internal::ValueOffset(op_);
+  ptrdiff_t offset = flags_internal::ValueOffset(op_);
 
   return reinterpret_cast<StorageT*>(p + offset);
 }
@@ -486,7 +486,7 @@ bool FlagImpl::ReadOneBool() const {
 }
 
 void FlagImpl::ReadSequenceLockedData(void* dst) const {
-  int size = Sizeof(op_);
+  size_t size = Sizeof(op_);
   // Attempt to read using the sequence lock.
   if (ABSL_PREDICT_TRUE(seq_lock_.TryRead(dst, AtomicBufferValue(), size))) {
     return;
diff --git a/absl/flags/internal/usage.cc b/absl/flags/internal/usage.cc
index 949709e8..a3b13ed3 100644
--- a/absl/flags/internal/usage.cc
+++ b/absl/flags/internal/usage.cc
@@ -148,8 +148,7 @@ class FlagHelpPrettyPrinter {
       }
 
       // Write the token, ending the string first if necessary/possible.
-      if (!new_line &&
-          (line_len_ + static_cast<int>(token.size()) >= max_line_len_)) {
+      if (!new_line && (line_len_ + token.size() >= max_line_len_)) {
         EndLine();
         new_line = true;
       }