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Previously, the ideal size for WebAPK's adaptive icon is set to be
108dp. It neglects the fact that a total of 30% padding is needed
to bridge the gap in safe zone percentage between the web spec
(https://www.w3.org/TR/appmanifest/#icon-masks) and the Android spec
(https://developer.android.com/guide/practices/ui_guidelines/icon_design_adaptive).

This CL changes it to the right value, 83dp.

Bug: 977173
Change-Id: I99411d10751e410a87ae3946bfe5175fe295057d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869372
Commit-Queue: Henry Jian <hzjian@google.com>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707564}