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We have recently removed usage of these deprecated fields from the code. This CL removes them from the protos too.

Review URL: https://codereview.chromium.org/467753002

Cr-Commit-Position: refs/heads/master@{#289130}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289130 0039d316-1c4b-4281-b951-d872f2087c98