Fixed assertions in SearchString.
Fixed assertions in SearchString.

BUG=None
TEST=Test searching for text in PDF. Shoud not DCHECK in debug builds.

Review URL: http://codereview.chromium.org/3573010

git-svn-id: http://src.chromium.org/svn/trunk/src@61572 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: de38921a5cdd8b289d661b66e1563398b9b97e21
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