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They are only needed for ownership, so no need to give them names and concrete
types. Removes some forward declarations from the header and serendipitously
happens to remove GOOGLE_CHROME_BUILD from the header as well.

No intended behavior change.

Bug: 961769
Change-Id: Ibaaf3375bd9d367b4cc83b9a8ec3e64193750a69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894032
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711431}