web-ui settings: Allow escape key to cancel the current search.
web-ui settings: Allow escape key to cancel the current search.

BUG=74862
TEST=Start a search, hit escape.  Verify that the search has stopped.
Review URL: http://codereview.chromium.org/6709006

git-svn-id: http://src.chromium.org/svn/trunk/src@78590 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: f309fd6a969f39e2f68b8a9ca58b3302cb4569aa
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