GitLab

Also gradually deprecate FileUtilHelper since its code is no longer
used in the actual code path (used only in unittests).

Original review (with lgtm): https://codereview.chromium.org/12223006/

No changes made from the original review (the link error should be gone now by other gypi change that is already landed)

BUG=146215
TEST=content_unittests:LocalFileSystem*
TBR=jam, tzik, tbarzic (original reviewers)

Review URL: https://codereview.chromium.org/12209068

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182193 0039d316-1c4b-4281-b951-d872f2087c98