Replace DFATAL with ERROR in PluginDataRemover::OnError.
Replace DFATAL with ERROR in PluginDataRemover::OnError.

It was failing regularly with Chrome OS build on the Login screen.

TBR=jam@chromium.org
BUG=None
TEST=Manual: no DCHECK when click 'Add user', 'Cancel' and 'Add user' again on the Login screen.

Review URL: http://codereview.chromium.org/9019010

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@115327 0039d316-1c4b-4281-b951-d872f2087c98

gavinp/chromium,ropik/chromium,ropik/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,gavinp/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,ropik/chromium,gavinp/chromium,yitian134/chromium,ropik/chromium,yitian134/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,adobe/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium