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

chrome/browser/browser_process_impl.h

Index: chrome/browser/browser_process_impl.h
diff --git a/chrome/browser/browser_process_impl.h b/chrome/browser/browser_process_impl.h
index ac0edded444b8bc0ad90f97fc696bb8349630bc2..384083694592e6bc5cee4664b4482f07d7c4d7df 100644
--- a/chrome/browser/browser_process_impl.h
+++ b/chrome/browser/browser_process_impl.h
@@ -189,6 +189,12 @@ class BrowserProcessImpl : public BrowserProcess, public NonThreadSafe {
     return shutdown_event_.get();
   }
 
+  virtual void CheckForInspectorFiles();
+
+  virtual bool have_inspector_files() const {
+    return have_inspector_files_;
+  }
+
  private:
   void CreateResourceDispatcherHost();
   void CreatePrefService();
@@ -276,6 +282,12 @@ class BrowserProcessImpl : public BrowserProcess, public NonThreadSafe {
   // 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);
 };