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No change to logic.

This adds two header files which this C++ file was depending on
transitively (for base::TimeDelta and OS_ANDROID/OS_IOS).

Bug: 1010369
Test: N/A
Change-Id: I16ceb2d05beaca66ea254f1e1c7ddd541b8ff05c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1835132Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702155}