Revert "Add diagnostic logs for transparent app icons for component extension"

The logs were added in codereview.chromium.org/102033005. The issue is no longer
able to repo. So removing the logs.


TBR=miket, xiyuan
BUG=314872

Review URL: https://codereview.chromium.org/158723007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250464 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 250464