[Sharesheet] Add nullcheck before callback.
We are adding a nullcheck before the callback because callers may call ShowBubble with NullCallback. Bug: 1142706 Change-Id: I2d3c1376b036057a2e5890e20a10f6478d5c7075 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2589139 Commit-Queue: Melissa Zhang <melzhang@chromium.org> Auto-Submit: Melissa Zhang <melzhang@chromium.org> Reviewed-by:Dominick Ng <dominickn@chromium.org> Cr-Commit-Position: refs/heads/master@{#836527}
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