views: Layout frame when widget goes fullscreen.

r239160 reveals a problem that widget's frame Layout is not called if a
widget goes fullscreen without changing its size or title. Explicit call
frame Layout when widget goes fullscreen.

BUG=335751
TEST=WidgetTest.FullscreenFrameLayout

Review URL: https://codereview.chromium.org/136473014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246084 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246084