DevTools: Fix access violation (null pointer) on document tear down.

webkit/glue/devtools/debugger_agent_impl.h

 // Copyright (c) 2009 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 WEBKIT_GLUE_DEVTOOLS_DEBUGGER_AGENT_IMPL_H_
 #define WEBKIT_GLUE_DEVTOOLS_DEBUGGER_AGENT_IMPL_H_
 
 #include <wtf/HashSet.h>
 
 #include "v8.h"
@@ skipping 11 matching lines @@
 }
 
 class DebuggerAgentImpl : public DebuggerAgent {
  public:
   DebuggerAgentImpl(WebViewImpl* web_view_impl,
                     DebuggerAgentDelegate* delegate,
                     WebDevToolsAgentImpl* webdevtools_agent);
   virtual ~DebuggerAgentImpl();
 
   // Creates utility context with injected js agent.
-  void CreateUtilityContext(WebCore::Document* document,
-                            v8::Persistent<v8::Context>* context);
+  void ResetUtilityContext(WebCore::Document* document,
+                           v8::Persistent<v8::Context>* context);
 
   // DebuggerAgent implementation.
   virtual void DebugBreak();
 
   void DebuggerOutput(const std::string& out);
 
   // Executes function with the given name in the utility context. Passes node
   // and json args as parameters. Note that the function called must be
   // implemented in the inject.js file.
   WebCore::String ExecuteUtilityFunction(
@@ skipping 14 matching lines @@
 
  private:
   WebViewImpl* web_view_impl_;
   DebuggerAgentDelegate* delegate_;
   WebDevToolsAgentImpl* webdevtools_agent_;
 
   DISALLOW_COPY_AND_ASSIGN(DebuggerAgentImpl);
 };
 
 #endif  // WEBKIT_GLUE_DEVTOOLS_DEBUGGER_AGENT_IMPL_H_