Suppress a leak for LayoutPluginTester.FLAKY_SelfDeletePluginGetUrl
Suppress a leak for LayoutPluginTester.FLAKY_SelfDeletePluginGetUrl

Also widen suppression for AutomatedUITestBase.IncognitoWindow to cover a 
similar leak to previous suppression.

BUG=50286
TEST=none


git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@53705 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