Fix issue 34343: "Tab to search" hint on omnibox disappears on drag dropped tab.
Fix issue 34343: "Tab to search" hint on omnibox disappears on drag dropped tab.

BUG=34343
TEST=Input www.google.com to trigger "tab to search" hint, then drag the tab into a new window, then check if "tab to search" hint is still there.

Review URL: http://codereview.chromium.org/576013

git-svn-id: http://src.chromium.org/svn/trunk/src@38347 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 8a95696b9160544c5838c8339c19ca89c6361b03
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser