mojo filesystem: Further clean ups.

components/filesystem/files_test_base.cc

Index: components/filesystem/files_test_base.cc
diff --git a/components/filesystem/files_test_base.cc b/components/filesystem/files_test_base.cc
index afc39a8a6f875c9af406d59b6d838183783e2621..d47be0227a70cc9031b19ec75c9c5c9bd86ee856 100644
--- a/components/filesystem/files_test_base.cc
+++ b/components/filesystem/files_test_base.cc
@@ -13,7 +13,7 @@
 
 namespace filesystem {
 
-FilesTestBase::FilesTestBase() : binding_(this) {
+FilesTestBase::FilesTestBase() {
 }
 
 FilesTestBase::~FilesTestBase() {
@@ -24,14 +24,9 @@ void FilesTestBase::SetUp() {
   shell()->ConnectToInterface("mojo:filesystem", &files_);
 }
 
-void FilesTestBase::OnFileSystemShutdown() {
-}
-
 void FilesTestBase::GetTemporaryRoot(DirectoryPtr* directory) {
   FileError error = FileError::FAILED;
-  files()->OpenFileSystem("temp", GetProxy(directory),
-                          binding_.CreateInterfacePtrAndBind(),
-                          mojo::Capture(&error));
+  files()->OpenTempDirectory(GetProxy(directory), mojo::Capture(&error));
   ASSERT_TRUE(files().WaitForIncomingResponse());
   ASSERT_EQ(FileError::OK, error);
 }