Revert 242849 "Recreate the compositor when we receive the targe..."

It seems like the most likely cause of ash_unittests failures on Win8 Aura bot.

> Recreate the compositor when we receive the target HWND from the metro viewer process on Windows 8 ASH.
> 
> This ensures that the compositor paints on the correct surface.
> 
> Fixes a regression which occurred after the latest aura refactoring changes. This resulted in nothing painting
> in Windows 8 ASH.
> 
> Ben's change to address the metro painting issue was reverted on Dec 20th due to ash_unittest crashes.
> 
> This fix works well with the ash_unittests and regular Chrome code path.
> 
> BUG=330179
> R=cpu@chromium.org, cpu
> TBR=beng
> 
> Review URL: https://codereview.chromium.org/123563003

TBR=ananta@chromium.org

Review URL: https://codereview.chromium.org/122953004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242858 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242858