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This reverts commit 37dea4b3.

Reason for revert: Likely caused the test failure of DownloadTest#testDuplicateHttpPostDownload_Cancel__UseDownloadOfflineContentProviderEnabled in android builders since:
* https://ci.chromium.org/p/chromium/builders/ci/android-marshmallow-x86-rel-non-cq/52
* https://ci.chromium.org/p/chromium/builders/ci/Lollipop%20Phone%20Tester/26965

Original change's description:
> Update message in permission dialog overlay warning
> 
> The current overlay warning message does not directly address the
> typical case: when dialer or chat bubble is displayed on the screen.
> 
> One change in behavior is that "Cancel" button of overlay warning dialog
> dismisses both overlay warning and permission dialog.
> 
> BUG=1127455
> R=​twellington@chromium.org
> 
> Change-Id: I9d5c13a6c7d4e52a3fa73b3193d1ef463272ab64
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2406148
> Reviewed-by: Theresa  <twellington@chromium.org>
> Reviewed-by: Andy Paicu <andypaicu@chromium.org>
> Commit-Queue: Pavel Yatsuk <pavely@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#807089}

TBR=pavely@chromium.org,twellington@chromium.org,andypaicu@chromium.org

Change-Id: I6ebee34a6bb6383b7ff58782608b81d0ec6d5cbb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1127455
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412836Reviewed-by: Haiyang Pan <hypan@google.com>
Commit-Queue: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/master@{#807278}