Suppress DownloadManager leaks.
Suppress DownloadManager leaks.

BUG=58449
TEST=none
TBR=willchan

Review URL: http://codereview.chromium.org/3597017

git-svn-id: http://src.chromium.org/svn/trunk/src@61935 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: fa23d268d44489ce55c65cc52223fdb15a63733e
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