Fix a crash when activating a select element inside a page action

chrome/browser/views/browser_bubble.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 CHROME_BROWSER_VIEWS_BROWSER_BUBBLE_H_
 #define CHROME_BROWSER_VIEWS_BROWSER_BUBBLE_H_
 
 #include "views/view.h"
 #include "views/widget/widget.h"
 
 // A class for creating a floating window that is "attached" to a particular
 // Browser.  If you don't install a delegate, the bubble will hide
 // automatically when the browser moves.  The bubble is only shown manually.
 // Users are expected to delete the bubble when finished with it.
 // Class assumes that RTL related mirroring is done by the view.
 class BrowserBubble {
  public:
   // Delegate to browser bubble events.
   class Delegate {
    public:
     // Called when the Browser Window that this bubble is attached to moves.
-    virtual void BubbleBrowserWindowMoved(BrowserBubble* bubble) = 0;
+    virtual void BubbleBrowserWindowMoved(BrowserBubble* bubble) {}
 
     // Called with the Browser Window that this bubble is attached to is
     // about to close.
-    virtual void BubbleBrowserWindowClosing(BrowserBubble* bubble) = 0;
+    virtual void BubbleBrowserWindowClosing(BrowserBubble* bubble) {}
 
     // Called when the bubble became active / got focus.
     virtual void BubbleGotFocus(BrowserBubble* bubble) {}
 
     // Called when the bubble became inactive / lost focus.
     virtual void BubbleLostFocus(BrowserBubble* bubble) {}
   };
 
   // Note that the bubble will size itself to the preferred size of |view|.
   // |view| is the embedded view, |frame| is widget that the bubble is being
@@ skipping 71 matching lines @@
   // The delegate isn't owned by the bubble.
   Delegate* delegate_;
 
   // Is the bubble attached to a Browser window.
   bool attached_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserBubble);
 };
 
 #endif  // CHROME_BROWSER_VIEWS_BROWSER_BUBBLE_H_