alternate ntp: clip middle omnibox when resizing browser window

- when resizing browser window, middle omnibox wasn't clipped; it would float in the root window if the browser window is too small to contain it
- fix to make LocationBarContainer clip its child LocationBarView
- LocationBarContainer's bounds is resized to within its parent's, while LocationBarView's width fills it but height stays the same, allowing the former to clip the latter without resizing the latter

BUG=145744
TEST=verify per bug rpt.


Review URL: https://chromiumcodereview.appspot.com/10907038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@156675 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed