Don't throw exceptions when v8 objects/contexts are missing, and catch

chrome/renderer/extensions/extension_helper.h

 // Copyright (c) 2012 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 CHROME_RENDERER_EXTENSIONS_EXTENSION_HELPER_H_
 #define CHROME_RENDERER_EXTENSIONS_EXTENSION_HELPER_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 38 matching lines @@
   // Returns the given extension's background page, or NULL if none.
   static content::RenderView* GetBackgroundPage(
       const std::string& extension_id);
 
   ExtensionHelper(content::RenderView* render_view, Dispatcher* dispatcher);
   virtual ~ExtensionHelper();
 
   int tab_id() const { return tab_id_; }
   int browser_window_id() const { return browser_window_id_; }
   chrome::ViewType view_type() const { return view_type_; }
-
-  // Helper to add a logging message to the root frame's console.
-  void AddMessageToRootConsole(content::ConsoleMessageLevel level,
-                               const std::string& message);
+  Dispatcher* dispatcher() const { return dispatcher_; }
 
  private:
   // RenderViewObserver implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void DidFinishDocumentLoad(WebKit::WebFrame* frame) OVERRIDE;
   virtual void DidFinishLoad(WebKit::WebFrame* frame) OVERRIDE;
   virtual void DidCreateDocumentElement(WebKit::WebFrame* frame) OVERRIDE;
   virtual void DidStartProvisionalLoad(WebKit::WebFrame* frame) OVERRIDE;
   virtual void FrameDetached(WebKit::WebFrame* frame) OVERRIDE;
   virtual void DidCreateDataSource(WebKit::WebFrame* frame,
@@ skipping 19 matching lines @@
                                        const std::string& error_message);
   void OnExecuteCode(const ExtensionMsg_ExecuteCode_Params& params);
   void OnGetApplicationInfo(int page_id);
   void OnNotifyRendererViewType(chrome::ViewType view_type);
   void OnSetTabId(int tab_id);
   void OnUpdateBrowserWindowId(int window_id);
   void OnAddMessageToConsole(content::ConsoleMessageLevel level,
                              const std::string& message);
   void OnAppWindowClosed();
 
-  // Helper to add a logging message to the root frame's console.
-  void AddMessageToRootConsole(content::ConsoleMessageLevel level,
-                               const string16& message);
-
   Dispatcher* dispatcher_;
 
   // The app info that we are processing. This is used when installing an app
   // via application definition. The in-progress web app is stored here while
   // its manifest and icons are downloaded.
   scoped_ptr<WebApplicationInfo> pending_app_info_;
 
   // Used to download the application definition file.
   scoped_ptr<webkit_glue::ResourceFetcher> app_definition_fetcher_;
 
@@ skipping 14 matching lines @@
 
   // Id number of browser window which RenderView is attached to.
   int browser_window_id_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHelper);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_EXTENSION_HELPER_H_