[Mac] Cleans up the StatusBubbleMac code.

chrome/browser/ui/cocoa/status_bubble_mac_unittest.mm

 // Copyright (c) 2011 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 <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 649 matching lines @@
   int windowWidth = NSWidth([window frame]);
   for (int x = 0; x < windowWidth; x += smallValue) {
     ASSERT_TRUE(CheckAvoidsMouse(x, smallValue));
   }
 
   // Simulate moving the mouse from right to left.
   for (int x = windowWidth; x >= 0; x -= smallValue) {
     ASSERT_TRUE(CheckAvoidsMouse(x, smallValue));
   }
 }
+
+TEST_F(StatusBubbleMacTest, ReparentBubble) {
+  // The second window is borderless, like the window used in fullscreen mode.
+  base::scoped_nsobject<NSWindow> fullscreenParent(
+      [[NSWindow alloc] initWithContentRect:NSMakeRect(0, 0, 800, 600)
+                                  styleMask:NSBorderlessWindowMask
+                                    backing:NSBackingStoreBuffered
+                                      defer:NO]);
+
+  // Switch parents with the bubble hidden.
+  bubble_->SwitchParentWindow(fullscreenParent);
+
+  // Switch back to the original parent with the bubble showing.
+  bubble_->SetStatus(UTF8ToUTF16("Showing"));
+  bubble_->SwitchParentWindow(test_window());
+}