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This CL makes sure initialized callback from the MediaStream constructor
is called asynchronously as it was causing a JavaScript crash
potentially caused by the fact that the MediaStream was not completely
registered with oilpan.

Bug: 1114398
Change-Id: If6058b183bdd07fa747d810efe0f6abed4914e49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352800Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#797649}