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Now that Blink-side objects about MediaStream are moved to oilpan's heap, we need to call WebHeap::collectGarbage in MediaStream tests to test that a particular object is gone. This CL adds necessary WebHeap::collectGarbage calls to content_unittests about MediaStreams.

Review URL: https://codereview.chromium.org/549153002

Cr-Commit-Position: refs/heads/master@{#294099}