Revert 242026 "Get Windows 8 ASH to work again. "

After this was landed almost all tests in ash_unittests are crashing.
http://build.chromium.org/p/chromium.win/buildstatus?builder=Win8%20Aura&number=13804
http://build.chromium.org/p/chromium.win/builders/Win8%20Aura/builds/13804/steps/ash_unittests/logs/stdio

> Get Windows 8 ASH to work again. 
> 
> This broke in revision 236017 which creates the compositor in the ctor of the RemoteRootWindowHostWin class.
> This in turn uses the GetAcceleratedWidget function which returns the desktop window as the metro viewer is not yet
> connected to the browser.
> 
> Moving the CreateCompositor call to the RemoteRootWindowHostWin::Connected function fixes this.
> 
> BUG=none
> TBR=ben
> 
> Review URL: https://codereview.chromium.org/64363004

TBR=ananta@chromium.org

Review URL: https://codereview.chromium.org/119863002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242053 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242053