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This CL replaces the deprecated openURL: call with
openURL:options:completionHandler:.

Bug: 774483
Change-Id: Idf9414bbacc9e633c98f1190a6aee89e2d0ebacd
Reviewed-on: https://chromium-review.googlesource.com/728733
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510251}