Fix IOBuffer leak in CertificateResourceHandler and StreamResourceHandler.

As found in https://crbug.com/361440#c9.

BUG=none

Review URL: https://codereview.chromium.org/232843003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@263047 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed