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Currently it is difficult to understand that the GAIA refresh logic only
triggers for the google.com domain. This patch adds a comment to this
effect and ensures that only Google domain URLs are processed when
executing a navigation.

Bug: 1131027
Change-Id: Iebdbd804ef378ce48dda95be98de3ed76c9642d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435184Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813656}