Remove sampling trace events from the binding layer

third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 93 matching lines @@
     v8::Local<v8::FunctionTemplate> domTemplate(const void* domTemplateKey, v8::FunctionCallback = 0, v8::Local<v8::Value> data = v8::Local<v8::Value>(), v8::Local<v8::Signature> = v8::Local<v8::Signature>(), int length = 0);
     v8::Local<v8::FunctionTemplate> existingDOMTemplate(const void* domTemplateKey);
     void setDOMTemplate(const void* domTemplateKey, v8::Local<v8::FunctionTemplate>);
 
     bool hasInstance(const WrapperTypeInfo* untrusted, v8::Local<v8::Value>);
     v8::Local<v8::Object> findInstanceInPrototypeChain(const WrapperTypeInfo*, v8::Local<v8::Value>);
 
     v8::Local<v8::Context> ensureScriptRegexpContext();
     void clearScriptRegexpContext();
 
-    const char* previousSamplingState() const { return m_previousSamplingState; }
-    void setPreviousSamplingState(const char* name) { m_previousSamplingState = name; }
-
     // EndOfScopeTasks are run by V8RecursionScope when control is returning
     // to C++ from script, after executing a script task (e.g. callback,
     // event) or microtasks (e.g. promise). This is explicitly needed for
     // Indexed DB transactions per spec, but should in general be avoided.
     void addEndOfScopeTask(PassOwnPtr<EndOfScopeTask>);
     void runEndOfScopeTasks();
     void clearEndOfScopeTasks();
 
     void setThreadDebugger(PassOwnPtr<ThreadDebugger>);
     ThreadDebugger* threadDebugger();
 
 private:
     V8PerIsolateData();
     ~V8PerIsolateData();
 
     typedef HashMap<const void*, v8::Eternal<v8::FunctionTemplate>> DOMTemplateMap;
     DOMTemplateMap& currentDOMTemplateMap();
     bool hasInstance(const WrapperTypeInfo* untrusted, v8::Local<v8::Value>, DOMTemplateMap&);
     v8::Local<v8::Object> findInstanceInPrototypeChain(const WrapperTypeInfo*, v8::Local<v8::Value>, DOMTemplateMap&);
 
     bool m_destructionPending;
     OwnPtr<gin::IsolateHolder> m_isolateHolder;
     DOMTemplateMap m_domTemplateMapForMainWorld;
     DOMTemplateMap m_domTemplateMapForNonMainWorld;
     OwnPtr<StringCache> m_stringCache;
     OwnPtr<V8HiddenValue> m_hiddenValue;
     ScopedPersistent<v8::Value> m_liveRoot;
     RefPtr<ScriptState> m_scriptRegexpScriptState;
 
-    const char* m_previousSamplingState;
-
     bool m_constructorMode;
     friend class ConstructorMode;
 
     int m_recursionLevel;
     bool m_isHandlingRecursionLevelError;
     bool m_isReportingException;
 
 #if ENABLE(ASSERT)
     int m_internalScriptRecursionLevel;
 #endif
     bool m_performingMicrotaskCheckpoint;
 
     Vector<OwnPtr<EndOfScopeTask>> m_endOfScopeTasks;
     OwnPtr<ThreadDebugger> m_threadDebugger;
 };
 
 } // namespace blink
 
 #endif // V8PerIsolateData_h