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We attempt to open a URL in a new tab through two different entry points
in the multiwindow use case:
- 1 when we populate self.sceneState.URLContextsToOpen per scene
- 2 when we populate self.mainController.startupParameters

This patch ensures that we only call one of these.

Bug: 1096489
Change-Id: I7c5c0fffc1d0f194d041f6ef3c734cb4da7ca385
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2254599
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780776}