Remove deprecated usage of URL.createObjectURL with MediaStream

Only straightforward usage has been removed, identified with regexp
"URL.createObjectURL.*stream".

Bug: 800767
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I83d563080b2f534e7d9e3062b1633017dc9a01a8
Reviewed-on: https://chromium-review.googlesource.com/878741
Commit-Queue: Florent Castelli <orphis@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#555378}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 703cf3e54c0778e5ef160dce99c8121acb140594
2 files changed