Fix incorrect usage of StringImpl::sizeInBytes.

mojo/public/cpp/bindings/lib/string_traits_wtf.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/public/cpp/bindings/string_traits_wtf.h"
 
 #include <string.h>
 
 #include "base/logging.h"
 #include "mojo/public/cpp/bindings/lib/array_internal.h"
 #include "third_party/WebKit/Source/wtf/text/StringUTF8Adaptor.h"
 
 namespace mojo {
 namespace {
 
 struct UTF8AdaptorInfo {
   explicit UTF8AdaptorInfo(const WTF::String& input) : utf8_adaptor(input) {
 #if DCHECK_IS_ON()
-    original_size_in_bytes = static_cast<size_t>(input.sizeInBytes());
+    original_size_in_bytes = input.charactersSizeInBytes();
 #endif
   }
 
   ~UTF8AdaptorInfo() {}
 
   WTF::StringUTF8Adaptor utf8_adaptor;
 
 #if DCHECK_IS_ON()
   // For sanity check only.
   size_t original_size_in_bytes;
 #endif
 };
 
 UTF8AdaptorInfo* ToAdaptor(const WTF::String& input, void* context) {
   UTF8AdaptorInfo* adaptor = static_cast<UTF8AdaptorInfo*>(context);
 
 #if DCHECK_IS_ON()
-  DCHECK_EQ(adaptor->original_size_in_bytes,
-            static_cast<size_t>(input.sizeInBytes()));
+  DCHECK_EQ(adaptor->original_size_in_bytes, input.charactersSizeInBytes());
 #endif
   return adaptor;
 }
 
 }  // namespace
 
 // static
 void StringTraits<WTF::String>::SetToNull(WTF::String* output) {
   if (output->isNull())
     return;
@@ skipping 27 matching lines @@
 
 // static
 bool StringTraits<WTF::String>::Read(StringDataView input,
                                      WTF::String* output) {
   WTF::String result = WTF::String::fromUTF8(input.storage(), input.size());
   output->swap(result);
   return true;
 }
 
 }  // namespace mojo