GitLab

Now LocalFileSystemTestOriginHelper is used only for
Sandbox FileSystems, I'd like to rename this to more
specific, clear name (as the previous name was too vague and
unclear).

BUG=241701,240658
TEST=existing tests
TBR=avi@chromium.org, nhiroki@chromium.org, tzik@chromium.org

Review URL: https://codereview.chromium.org/15810004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202037 0039d316-1c4b-4281-b951-d872f2087c98