Replace DCHECK in the FileSystemQuota test code with ASSERT_TRUE.
Replace DCHECK in the FileSystemQuota test code with ASSERT_TRUE.

BUG=none
TEST=FileSystemQuotaTest.*
TBR=phajdan

Review URL: http://codereview.chromium.org/3638002

git-svn-id: http://src.chromium.org/svn/trunk/src@62017 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 33367ef56089e54e7e664cf2aa866edbe9365641
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