Strip leading &quotjavascript:&quot schemas from text pasted or dropped into the omnibox.

      Do not show the Paste and Go option for URIs with a javascript schema.

BUG=82181
TEST=N/A
Review URL: http://codereview.chromium.org/6982011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86525 0039d316-1c4b-4281-b951-d872f2087c98