Revert 41342 - Make bubble more tolerant of notification order when quitting.
Revert 41342 - Make bubble more tolerant of notification order when quitting.

BUG=http://crbug.com/37807

TEST=\
Run a debug build of Chrome like this:  
  NSZombieEnabled=YES xcodebuild/Debug/Chromium.app/Contents/MacOS/Chromium 
Open a bubble then CmdQ.
Make sure you don't see a line like this:
  20100310 19:24:20.381 Chromium[73024:903] *** [ChromeBrowserWindow removeChildWindow:]: message sent to deallocated instance 0x18f8b2a0
Repeat 20 times.


Review URL: http://codereview.chromium.org/839003

TBR=jrg@chromium.org
Review URL: http://codereview.chromium.org/902001

git-svn-id: http://src.chromium.org/svn/trunk/src@41350 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 64be3b26419d68323966f0c64729cc7bc8b239ea
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser