Don't show "Inspect Element" in the context menu if we can't inspect.

chrome/browser/browser_process_impl.h

 // Copyright (c) 2006-2008 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.
 
 // When each service is created, we set a flag indicating this. At this point,
 // the service initialization could fail or succeed. This allows us to remember
 // if we tried to create a service, and not try creating it over and over if
 // the creation failed.
 
 #ifndef CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_
@@ skipping 171 matching lines @@
 
   virtual MemoryModel memory_model() {
     DCHECK(CalledOnValidThread());
     return memory_model_;
   }
 
   virtual base::WaitableEvent* shutdown_event() {
     return shutdown_event_.get();
   }
 
+  virtual void CheckForInspectorFiles();
+
+  virtual bool have_inspector_files() const {
+    return have_inspector_files_;
+  }
+
  private:
   void CreateResourceDispatcherHost();
   void CreatePrefService();
   void CreateMetricsService();
 
   void CreateIOThread();
   void ResetIOThread();
   static void CleanupOnIOThread();
 
   void CreateFileThread();
@@ skipping 67 matching lines @@
   bool checked_for_new_frames_;
   bool using_new_frames_;
 
   // This service just sits around and makes thumanails for tabs. It does
   // nothing in the cosntructor so we don't have to worry about lazy init.
   ThumbnailGenerator thumbnail_generator_;
 
   // An event that notifies when we are shutting-down.
   scoped_ptr<base::WaitableEvent> shutdown_event_;
 
+  // Runs on the file thread and stats the inspector's directory, filling in
+  // have_inspector_files_ with the result.
+  void DoInspectorFilesCheck();
+  // Our best estimate about the existence of the inspector directory.
+  bool have_inspector_files_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserProcessImpl);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_PROCESS_IMPL_H_