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When run with the stub Widevine CDM, these tests suffer from a race
between the result of a failed StubCdm::Decrypt() and a failed
StubCdm::UpdateSession().  The tests expect the latter, but the former
often arrives first.

By allowing the stub to InitializeVideoDecoder() successfully and
returning cdm::kNoKey upon DecryptAndDecodeFrame() attempt we avoid the
DecryptingDemuxerStream errors altogether, so there is no race anymore.

Bug: 768745
Test: 'browser_tests --gtest_filter=*MSE_Widevine*' pass when run with the stub Widevine CDM

Change-Id: I35a35d006d118f8f7f9a8a64cf9334017644f4ea
Reviewed-on: https://chromium-review.googlesource.com/831026Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Wojciech Dzierżanowski <wdzierzanowski@opera.com>
Cr-Commit-Position: refs/heads/master@{#524663}