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An ImageCapture object may be created from an HTMLElement that is part
of a context that has already been destroyed. Check to see if the frame
has been detached before trying to access the interface provider.

Bug: 749499
Change-Id: I25838392413b218212fe2cb16a119d4379bea659
Reviewed-on: https://chromium-review.googlesource.com/592649Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491233}