Remove SetHostSize/Bounds from RootWindow in favor of just calling SetBounds() on host()

R=sky@chromium.org
http://crbug.com/308846

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=244005

Review URL: https://codereview.chromium.org/128753002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244244 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244244