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The webview loadcommit event's url property is documented as being
"the URL that committed," however we are currently setting it to
whatever the webview's src attribute is set to.

We now set the event's url property correctly.

See https://developer.chrome.com/apps/tags/webview#event-loadcommit

Bug: 1149615
Change-Id: I7e00bc78a503141893b0414ee1c8a4f7e2eecde2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545264
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Reviewed-by: James MacLean <wjmaclean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841296}