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Builds on https://chromium-review.googlesource.com/c/chromium/src/+/2378144

Adds README.md and OWNERS files

Adds a browser test for ShareServiceImpl, verifying that share()
requests fail gracefully.

ShareServiceImpl now implements content::WebContentsObserver, and
overrides RenderFrameDeleted() to clear the render_frame_host_ member.

ShareServiceImpl now builds for Chrome OS in addition to Windows.



Bug: 1035527
Change-Id: Ic1ba0560468a69fb6ab0d3c141937e5439f656e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2383228
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Auto-Submit: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803397}