Mac: Don't show dialogs for debug messages.
Mac: Don't show dialogs for debug messages.

They're printed to stderr, and the dialogs are often too high to fit on a (30'') screen.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6482013

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@75765 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser