[Input View] Restores the keyboard size to default when switching to default keyboard url.

BUG=316524
TEST=Locally verified in sandbox.

Review URL: https://codereview.chromium.org/98203011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240708 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240708