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RequestTrackerImpl was needed when Chrome used UIWebView.

Bug: 585700
Change-Id: I755e6377bc05c4f7018cad2fe6ff2c79e6b5d8c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1601665
Auto-Submit: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660070}