Only close popup bubble when a tab switch happens.

chrome/browser/ui/cocoa/tabs/tab_strip_controller.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_TABS_TAB_STRIP_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_TABS_TAB_STRIP_CONTROLLER_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 
@@ skipping 143 matching lines @@
 // "switched" every time the user switches tabs. The children of this view
 // will be released, so if you want them to stay around, make sure
 // you have retained them.
 // |delegate| is the one listening to filtered TabStripModelObserverBridge's
 // events (see TabStripControllerDelegate for more details).
 - (id)initWithView:(TabStripView*)view
         switchView:(NSView*)switchView
            browser:(Browser*)browser
           delegate:(id<TabStripControllerDelegate>)delegate;
 
+// Returns the model behind this controller.
+- (TabStripModel*)tabStripModel;
+
 // Return the view for the currently active tab.
 - (NSView*)activeTabView;
 
 // Set the frame of the active tab, also updates the internal frame dict.
 - (void)setFrameOfActiveTab:(NSRect)frame;
 
 // Move the given tab at index |from| in this window to the location of the
 // current placeholder.
 - (void)moveTabFromIndex:(NSInteger)from;
 
@@ skipping 77 matching lines @@
 - (TabContentsController*)activeTabContentsController;
 
   // See comments in browser_window_controller.h for documentation about these
   // functions.
 - (void)attachConstrainedWindow:(ConstrainedWindowMac*)window;
 - (void)removeConstrainedWindow:(ConstrainedWindowMac*)window;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_TABS_TAB_STRIP_CONTROLLER_H_