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Previously, the plugin completely skipped virtual specifier checks on
Gmock objects since it wasn't smart enough to filter out warnings caused
by Gmock macros. In preparation for making the plugin smarter, this CL
fixes existing virtual specifier warnings in //google_apis/gaia.

This CL was uploaded by git cl split.

R=rogerta@chromium.org

Bug: 837148
Change-Id: Ia35de72ebe190980cbce1b3a8b0e96bd7f6fa246
Reviewed-on: https://chromium-review.googlesource.com/1031198Reviewed-by: Roger Tawa <rogerta@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554833}