Speed up the test for IsSearchProviderInstalled by making it run multiple test pages in parallel.
Speed up the test for IsSearchProviderInstalled by making it run multiple test pages in parallel.

BUG=38475
TEST=This is the test.

Review URL: http://codereview.chromium.org/3159030

git-svn-id: http://src.chromium.org/svn/trunk/src@56948 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 4499f79862a10cba7e2bb2747fc081cde344a985
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