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We update behavior to match spec change
https://github.com/w3c/web-share/pull/113

If a share() call is in progress and share() is called again,
the new share request fails immediately.

WebShare for ChromeOS and Windows will only ever have this
new behavior. WebShare for Android (already shipped)
would previously spin up multiple shares simultaneously.

Spec:
https://w3c.github.io/web-share/#share-method


Note: we no longer have an Android post Lollipop MR1
test for user cancellation of the dialog - the existing
test simply issues a second share request.

Bug: 1002337
Change-Id: I1bef4923cb048a28f882f9dac889c841f1fc8265
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425933Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811265}