[GTTF] Make DirectoryWatcher tests faster by about 15 seconds.
[GTTF] Make DirectoryWatcher tests faster by about 15 seconds.

TEST=Covered by base_unittests.
BUG=none

Review URL: http://codereview.chromium.org/371062

git-svn-id: http://src.chromium.org/svn/trunk/src@31451 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 5d58db9e9b6203b7b1bccb8f2caea08f7e96bc3c
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