Simplify fullscreen exit bubble on mac; updating always creates one freshly.

chrome/browser/ui/cocoa/browser_window_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/browser_window_controller.h"
 
 #include <cmath>
 #include <numeric>
 
 #include "base/command_line.h"
@@ skipping 1964 matching lines @@
 
 - (void)exitFullscreen {
   // url: and bubbleType: are ignored when leaving fullscreen.
   [self setFullscreen:NO url:GURL() bubbleType:FEB_TYPE_NONE];
 }
 
 - (void)updateFullscreenExitBubbleURL:(const GURL&)url
                            bubbleType:(FullscreenExitBubbleType)bubbleType {
   fullscreenUrl_ = url;
   fullscreenBubbleType_ = bubbleType;
-  if (bubbleType == FEB_TYPE_NONE ||
-      bubbleType == FEB_TYPE_BROWSER_FULLSCREEN_EXIT_INSTRUCTION) {
-    // Show no exit instruction bubble on Mac when in Browser Fullscreen.
-    [self destroyFullscreenExitBubbleIfNecessary];
-  } else {
-    if (!fullscreenExitBubbleController_.get()) {
-      [self showFullscreenExitBubbleIfNecessary];
-    }
-    [fullscreenExitBubbleController_.get() updateURL:url bubbleType:bubbleType];
-  }
+  [self showFullscreenExitBubbleIfNecessary];
 }
 
 - (BOOL)isFullscreen {
   return (fullscreenWindow_.get() != nil) ||
          ([[self window] styleMask] & NSFullScreenWindowMask) ||
          enteringFullscreen_;
 }
 
 - (void)togglePresentationModeForLionOrLater:(id)sender {
   // Called only by the presentation mode toggle button.
@@ skipping 212 matching lines @@
 
 - (BOOL)supportsBookmarkBar {
   return [self supportsWindowFeature:Browser::FEATURE_BOOKMARKBAR];
 }
 
 - (BOOL)isTabbedWindow {
   return browser_->is_type_tabbed();
 }
 
 @end  // @implementation BrowserWindowController(WindowType)