FileAPI: Factor out getting root URI and FS name parts into each FS backend

webkit/browser/fileapi/copy_or_move_file_validator_unittest.cc

Index: webkit/browser/fileapi/copy_or_move_file_validator_unittest.cc
diff --git a/webkit/browser/fileapi/copy_or_move_file_validator_unittest.cc b/webkit/browser/fileapi/copy_or_move_file_validator_unittest.cc
index 51dbe77b2c88471eae01d28bba993c91d3fc82fb..b271b7711bfb0cdc84551444e77128d27d86d249 100644
--- a/webkit/browser/fileapi/copy_or_move_file_validator_unittest.cc
+++ b/webkit/browser/fileapi/copy_or_move_file_validator_unittest.cc
@@ -27,7 +27,9 @@ namespace {
 const FileSystemType kNoValidatorType = kFileSystemTypeTemporary;
 const FileSystemType kWithValidatorType = kFileSystemTypeTest;
 
-void ExpectOk(base::PlatformFileError error) {
+void ExpectOk(const GURL& origin_url,
+              const std::string& name,
+              base::PlatformFileError error) {
   ASSERT_EQ(base::PLATFORM_FILE_OK, error);
 }