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Minor refactor: DidRequestPermission is rendered more readable with an
early exit in case there is no implementation.

Change-Id: Icd06cd9e18162a3363138d830fe8e01e41c32a14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450839
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Auto-Submit: Olivier Yiptong <oyiptong@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814376}