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Now that we have settled on using an animated icon on desktop, and a
mini infobar on Android, remove the ability to specify the UI flavor
using either variation parameters or FeatureEntry::FeatureParams.

The CL also removes now-obsolete string literals, and cleans up tests:
  -- PermissionRequestNotificationAndroidTest.ShouldShowAsNotification
     already codified the expectation that the UI flavor variation
     parameters are ignored, this test is now removed.
  -- PermissionRequestManagerBrowserTest_StaticIcon.* verified behavior
     that was orthogonal to whether the quiet prompt is shown as static
     or animated icon, and the test for the latter still exists, so the
     former is now removed.

Bug: 1030216
Change-Id: I32c27d327a8704572bb617cd0800338587f58dab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1948428Reviewed-by: Kamila Hasanbega <hkamila@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720917}