Update a suppression after TabContents -> WebContents.
Update a suppression after TabContents -> WebContents.

BUG=chromium:102255
TEST=memory waterfall becomes greener
TBR=rdsmith@chromium.org, jam@chromium.org

Review URL: http://codereview.chromium.org/9008073

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@116346 0039d316-1c4b-4281-b951-d872f2087c98

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