Making window.focus()/blur() work only when there is a user gesture.

chrome/browser/blocked_popup_container.h

 // Copyright (c) 2010 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.
 
 // Defines the public interface for the blocked popup notifications. This
 // interface should only be used by TabContents. Users and subclasses of
 // TabContents should use the appropriate methods on TabContents to access
 // information about blocked popups.
 
 #ifndef CHROME_BROWSER_BLOCKED_POPUP_CONTAINER_H_
@@ skipping 42 matching lines @@
   virtual void NavigationStateChanged(const TabContents* source,
                                       unsigned changed_flags) {}
 
   // Forwards AddNewContents to our |owner_|.
   virtual void AddNewContents(TabContents* source,
                               TabContents* new_contents,
                               WindowOpenDisposition disposition,
                               const gfx::Rect& initial_position,
                               bool user_gesture);
 
-  // Ignore activation requests from the TabContents we're blocking.
+  // Ignore activation/deactivation requests from the TabContents we're
+  // blocking.
   virtual void ActivateContents(TabContents* contents) {}
+  virtual void DeactivateContents(TabContents* contents) {}
 
   // Ignored; BlockedPopupContainer doesn't display a throbber.
   virtual void LoadingStateChanged(TabContents* source) {}
 
   // Removes |source| from our internal list of blocked popups.
   virtual void CloseContents(TabContents* source);
 
   // Changes the opening rectangle associated with |source|.
   virtual void MoveContents(TabContents* source, const gfx::Rect& new_bounds);
 
@@ skipping 25 matching lines @@
   // The TabContents that owns and constrains this BlockedPopupContainer.
   TabContents* owner_;
 
   // Information about all blocked popups.
   BlockedPopups blocked_popups_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(BlockedPopupContainer);
 };
 
 #endif  // CHROME_BROWSER_BLOCKED_POPUP_CONTAINER_H_