Mac: Make status bubbles pop properly when mouse leaves content area.

chrome/browser/cocoa/base_view.mm

 // 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.
 
 #include "chrome/browser/cocoa/base_view.h"
 
 @implementation BaseView
 
 - (id)initWithFrame:(NSRect)frame {
   self = [super initWithFrame:frame];
   if (self) {
     trackingArea_ =
         [[NSTrackingArea alloc] initWithRect:frame
-                                     options:NSTrackingMouseMoved |
+                                     options:NSTrackingMouseEnteredAndExited |
+                                             NSTrackingMouseMoved |
                                              NSTrackingActiveInActiveApp |
                                              NSTrackingInVisibleRect
                                        owner:self
                                     userInfo:nil];
     [self addTrackingArea:trackingArea_];
   }
   return self;
 }
 
 - (void)dealloc {
@@ skipping 78 matching lines @@
 }
 
 - (NSRect)RectToNSRect:(gfx::Rect)rect {
   NSRect new_rect(NSRectFromCGRect(rect.ToCGRect()));
   new_rect.origin.y =
       [self bounds].size.height - new_rect.origin.y - new_rect.size.height;
   return new_rect;
 }
 
 @end