Remove fileapi::FileSystemFileUtil dependency from chrome/ syncfs code

BUG=265770

Review URL: https://codereview.chromium.org/28483002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229740 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229740