Update BrowserView::ProcessFullscreen OmniboxViewWin use; etc.

Make OmniboxViewWin code in ProcessFullscreen conditional.
Move OmniboxView util functions to omnibox_views.[h|cc].
Minor refactoring; init OmniboxViewViews::textfield_ to NULL.

BUG=131660,134263
TEST=Omnibox doesn't trigger crashes after exiting fullscreen.

Review URL: https://chromiumcodereview.appspot.com/10636023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@144001 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed