ScriptStreamer: make state variables main-thread-only.

third_party/WebKit/Source/bindings/core/v8/ScriptStreamer.h

 // Copyright 2014 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.
 
 #ifndef ScriptStreamer_h
 #define ScriptStreamer_h
 
 #include <memory>
 
 #include "core/CoreExport.h"
@@ skipping 123 matching lines @@
   // deletion by calling cancel().
   Member<ScriptResource> m_resource;
   // Whether ScriptStreamer is detached from the Resource. In those cases, the
   // script data is not needed any more, and the client won't get notified
   // when the loading and streaming are done.
   bool m_detached;
 
   SourceStream* m_stream;
   std::unique_ptr<v8::ScriptCompiler::StreamedSource> m_source;
   bool m_loadingFinished;  // Whether loading from the network is done.
-  // Whether the V8 side processing is done. Will be used by the main thread
-  // and the streamer thread; guarded by m_mutex.
-  bool m_parsingFinished;
+  bool m_parsingFinished;  // Whether the V8 side processing is done.
   // Whether we have received enough data to start the streaming.
   bool m_haveEnoughDataForStreaming;
 
   // Whether the script source code should be retrieved from the Resource
-  // instead of the ScriptStreamer; guarded by m_mutex.
+  // instead of the ScriptStreamer.
   bool m_streamingSuppressed;
 
   // What kind of cached data V8 produces during streaming.
   v8::ScriptCompiler::CompileOptions m_compileOptions;
 
   RefPtr<ScriptState> m_scriptState;
 
   // For recording metrics for different types of scripts separately.
   Type m_scriptType;
 
   // Keep the script URL string for event tracing.
   const String m_scriptURLString;
 
   // Keep the script resource dentifier for event tracing.
   const unsigned long m_scriptResourceIdentifier;
 
-  mutable Mutex m_mutex;
-
   // Encoding of the streamed script. Saved for sanity checking purposes.
   v8::ScriptCompiler::StreamedSource::Encoding m_encoding;
 
   RefPtr<WebTaskRunner> m_loadingTaskRunner;
 };
 
 }  // namespace blink
 
 #endif  // ScriptStreamer_h