Fixes a test_shell crash caused by attempting to cancel the plugin stream request after it has been deleted.
Fixes a test_shell crash caused by attempting to cancel the plugin stream request after it
has been deleted.

TBR=jam

Review URL: http://codereview.chromium.org/159358

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@21559 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