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Starting with iOS 13, sourceApplication is only set when openURL is
called from an application with the same team identifier.
Oddly, it is also nil when calling from extension.

Bug: 1020228
Change-Id: I9876647c30350e2242d20da2ab045805a9864932
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903349Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715221}