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In some builds there were duplicate symbols because a cc file
was compiled twice and linked with itself. This happened because
some code accidentally included the cc file instead of the header.

Change-Id: Ifa145ce13190a9fa855e06986ca60605005aa9fc
Reviewed-on: https://chromium-review.googlesource.com/1255824
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595853}