Valgrind: Widen a suppression for ExtensionMessageService::DispatchEventToRenderers.
Valgrind: Widen a suppression for ExtensionMessageService::DispatchEventToRenderers.

BUG=42880
TEST=Valgrind Mac goes green.
TBR=willchan
Review URL: http://codereview.chromium.org/1994010

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@46849 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser