[Omnibox Views] Refactor infobar anchoring math to be internal to LocationBarView

R=pkasting@chromium.org

Review URL: https://codereview.chromium.org/59453008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234611 0039d316-1c4b-4281-b951-d872f2087c98
Clean up notification usage; this is unused after r215327.

BUG=170921
TEST=none

Review URL: https://codereview.chromium.org/65253003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234612 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234612