Remove HTMLMediaElement::updateActiveTextTrackCues log statement.
Remove HTMLMediaElement::updateActiveTextTrackCues log statement.

Remove an annoying log statement that prints all the time during the
lifetime of the HTMLMediaElement, but doesn't provide any value 99.999%
of the time.

Review URL: https://codereview.chromium.org/139753002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@165166 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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