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AutofillDownloadManager calls variations::ShouldAppendVariationsHeader()
to know if the specified URL is trusted by Google. But this call has a
side effect to record histograms, and results in double counting for
those uses.

This patch factors out Google trusted URL checks into google_util, and
change variations:: and AutofillDownloadManager to call
google_util::IsGoogleRelevantUrl for each slightly different purpose.

Bug: None
Change-Id: I66dc666011e4cc57327e06889adaeb2828ac6232
Tbr: mahmadi@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/1451504
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629922}