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This CL fixes most of the gn check issues in chrome/credential_provider
by adding necessary deps and removing some unused includes. This CL
enables gn check for the directories that are completely fixed. The
last issue will be fixed in a followup CL since it's more complex.

Bug: 1106758
Change-Id: Ib382eb7b3af808db00d806ffd46d8d9c76ecb280
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2304172
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789640}