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Currently media code uses a separate logging system (MediaLog) and some important messages are reported there, but are not reported in the main browser log. Currently media log messages can only be seen in the chrome://media-internals, but since they are very useful, we should add them to the main browser log as well.

BUG=453180

Review URL: https://codereview.chromium.org/877273002

Cr-Commit-Position: refs/heads/master@{#322425}