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This change uses code that is compatible with both Service Worker-based
extensions and background/event page-based extensions to implement the
browserAction.setIcon() JavaScript code.

Bug: 1015136
Change-Id: I1bc55cd5da2cc106e8d74dba172122d2bf943d31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1921640Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: David Bertoni <dbertoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718928}