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Also update MediaDrmBridge to use org.chromium.base.Log. See bug 472152.

BUG=487435, 472152
TEST=Tested using a test certificate. We only get one key request instead of two, and playback works.

Review URL: https://codereview.chromium.org/1145583003

Cr-Commit-Position: refs/heads/master@{#330665}