Fix DCHECK that was firing in metrics service in debug builds.  This particular case was harmless with no underlying bugs.
Fix DCHECK that was firing in metrics service in debug builds.  This particular case was harmless with no underlying bugs.

BUG=29085
Review URL: http://codereview.chromium.org/449068

git-svn-id: http://src.chromium.org/svn/trunk/src@33489 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: d30cb6dbeba552eecc7d8a58d5f3210973a5951d
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser