mac: Prepare most test code for -Wunused-functions too.

content/browser/fileapi/sandbox_file_system_backend_unittest.cc

Index: content/browser/fileapi/sandbox_file_system_backend_unittest.cc
diff --git a/content/browser/fileapi/sandbox_file_system_backend_unittest.cc b/content/browser/fileapi/sandbox_file_system_backend_unittest.cc
index 50f1c06303ca2eec1b5c08699f2fa5da0410d33d..4bb12261a978637ce74e2b0c98f9efae5e9bfb70 100644
--- a/content/browser/fileapi/sandbox_file_system_backend_unittest.cc
+++ b/content/browser/fileapi/sandbox_file_system_backend_unittest.cc
@@ -66,12 +66,6 @@ const struct RootPathFileURITest {
     "000" PS "p", NULL },
 };
 
-FileSystemURL CreateFileSystemURL(const char* path) {
-  const GURL kOrigin("http://foo/");
-  return FileSystemURL::CreateForTest(
-      kOrigin, kFileSystemTypeTemporary, base::FilePath::FromUTF8Unsafe(path));
-}
-
 void DidOpenFileSystem(base::PlatformFileError* error_out,
                        const GURL& origin_url,
                        const std::string& name,