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

chrome/renderer/extensions/extension_helper.h

Index: chrome/renderer/extensions/extension_helper.h
diff --git a/chrome/renderer/extensions/extension_helper.h b/chrome/renderer/extensions/extension_helper.h
index a1d934c9581b41ba838208ef4cafb664961fa6d3..d9a303e49b34d34e4bdb2dbb02419c2ae794bb7d 100644
--- a/chrome/renderer/extensions/extension_helper.h
+++ b/chrome/renderer/extensions/extension_helper.h
@@ -56,10 +56,7 @@ class 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.
@@ -99,10 +96,6 @@ class ExtensionHelper
                              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