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Do this by changing the default implementation to true for OS_ANDROID.
This also allows removing the android webview override.

Bug: 1038894
Change-Id: I1be3c680a32116bc8867958d85f89ad5302a525d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2006208
Commit-Queue: Bo <boliu@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Auto-Submit: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732842}