[Mac] Have BaseBubbleController dismiss bubbles when they would lose key state on 10.8.

chrome/browser/ui/cocoa/bookmarks/bookmark_bubble_controller.mm

 // Copyright (c) 2012 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.
 
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bubble_controller.h"
 
 #include "base/mac/bundle_locations.h"
 #include "base/mac/mac_util.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
@@ skipping 203 matching lines @@
                                self,
                                @selector(dismissWithoutEditing:)));
   chrome_observer_.reset(new BookmarkBubbleNotificationBridge(
                              self, @selector(dismissWithoutEditing:)));
 
   // Pulse something interesting on the bookmark bar.
   [self startPulsingBookmarkButton:node_];
 
   [parentWindow addChildWindow:window ordered:NSWindowAbove];
   [window makeKeyAndOrderFront:self];
+  [self registerKeyStateEventTap];
 }
 
 - (void)close {
   [[BrowserWindowController browserWindowControllerForWindow:self.parentWindow]
       releaseBarVisibilityForOwner:self withAnimation:YES delay:NO];
 
   [super close];
 }
 
 // Shows the bookmark editor sheet for more advanced editing.
@@ skipping 165 matching lines @@
   NSInteger idx = [menu indexOfItemWithRepresentedObject:parentValue];
   DCHECK(idx != -1);
   [folderPopUpButton_ selectItemAtIndex:idx];
 }
 
 - (NSPopUpButton*)folderPopUpButton {
   return folderPopUpButton_;
 }
 
 @end  // implementation BookmarkBubbleController(ExposedForUnitTesting)