Fix memory leak in NotificationProviderApiTest.Events.

This new test had a memory leak as reported by Linux ASan LSan:

http://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20LSan%20Tests%20%281%29/builds/4540/steps/browser_tests/logs/Events

TBR=kalman@chromium.org, liyanhou@chromium.org
BUG=397197
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/433073003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287170 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed