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jrummell@chromium.org authored
Add lock around use of callbacks. BUG=329530 TEST=browser_tests for encrypted media pass TBR=glider Review URL: https://codereview.chromium.org/105933004 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244056 0039d316-1c4b-4281-b951-d872f2087c98
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