Update WebFrameClient::didClearWindowObject API

The world_id is now always zero.

BUG=none
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Review URL: https://codereview.chromium.org/275453002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269569 0039d316-1c4b-4281-b951-d872f2087c98
14 files changed