Make image decoding traces off by default
Make image decoding traces off by default

R=hclam
CC=reveman
BUG=405463

Review URL: https://codereview.chromium.org/488983002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@180816 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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