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WebMediaPlayer should own media_log_, fix the leak there.

Review URL: https://codereview.chromium.org/496103002

Cr-Commit-Position: refs/heads/master@{#291443}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@291443 0039d316-1c4b-4281-b951-d872f2087c98