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When on the last focusable view in a Container FocusManager would
start searching from Widget. Problem is child Widgets share the same
FocusManager, meaning focus in a child widget wraps to the parent,
which is unexpected in most situations. In theory there could be
situations where we should wrap to the parent, but I don't think we
have any.

BUG=276213
TEST=covered by test
R=dmazzoni@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23475012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221437 0039d316-1c4b-4281-b951-d872f2087c98