Remove errorpage_uitest.cc, which is now empty.
Remove errorpage_uitest.cc, which is now empty.

The file was supposed to be removed by crrev.com/100701
but the empty file was left for some reason.

TEST=build chrome tests
BUG=79412

Review URL: http://codereview.chromium.org/8052013

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@102972 0039d316-1c4b-4281-b951-d872f2087c98

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