Heapchecker: Suppress leaks from a new DownloadManagerTest.
Heapchecker: Suppress leaks from a new DownloadManagerTest.

BUG=49307
TEST=none
TBR=tyoshino
Review URL: http://codereview.chromium.org/3037013

git-svn-id: http://src.chromium.org/svn/trunk/src@53167 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 2fcfc3b83da5772a9805c37c208228265e032da0
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