Update suppression for leaks from  DownloadService::GetDownloadManager
Update suppression for leaks from  DownloadService::GetDownloadManager

Per http://build.chromium.org/p/tryserver.chromium/builders/linux_chromeos_valgrind/builds/119/

BUG=120893,chromium-os:28149
TEST=none

Review URL: https://chromiumcodereview.appspot.com/9924012

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@129653 0039d316-1c4b-4281-b951-d872f2087c98

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