[Instant] Fixes several cases of search terms extraction.

Removes the virtual URL hack in favor of ExtraData on NavigationEntry.

BUG=159326, 153477, 167067
TEST=InstantExtendedTest


Review URL: https://chromiumcodereview.appspot.com/12179025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@183374 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed