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Given that MediaStream objects in the Blink side are allocated on Oilpan's heap, we need to trigger a GC to collect MediaStream objects in the Chromium side that depend on the lifetime of the MediaStream objects in the Blink side.

This CL adds Heap::collectAllGarbage to TearDown methods of MediaStream content_unittests. This guarantees that MediaStream objects used in the content_unittests are collected before the content_unittests finish. Otherwise, the LSan complains that the MediaStream objects leak in the content_unittests.

This is an issue that happens only in testing.

BUG=340522

Review URL: https://codereview.chromium.org/566793002

Cr-Commit-Position: refs/heads/master@{#295920}