mojo filesystem: Further clean ups.

components/filesystem/files_test_base.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_FILESYSTEM_FILES_TEST_BASE_H_
 #define COMPONENTS_FILESYSTEM_FILES_TEST_BASE_H_
 
 #include "base/macros.h"
 #include "components/filesystem/public/interfaces/file_system.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/shell/public/cpp/application_test_base.h"
 
 namespace filesystem {
 
-class FilesTestBase : public mojo::test::ApplicationTestBase,
-                      public filesystem::FileSystemClient {
+class FilesTestBase : public mojo::test::ApplicationTestBase {
  public:
   FilesTestBase();
   ~FilesTestBase() override;
 
   // Overridden from mojo::test::ApplicationTestBase:
   void SetUp() override;
 
-  // Overridden from FileSystemClient:
-  void OnFileSystemShutdown() override;
-
  protected:
   // Note: This has an out parameter rather than returning the |DirectoryPtr|,
   // since |ASSERT_...()| doesn't work with return values.
   void GetTemporaryRoot(DirectoryPtr* directory);
 
   FileSystemPtr& files() { return files_; }
 
  private:
-  mojo::Binding<filesystem::FileSystemClient> binding_;
   FileSystemPtr files_;
 
   DISALLOW_COPY_AND_ASSIGN(FilesTestBase);
 };
 
 }  // namespace filesystem
 
 #endif  // COMPONENTS_FILESYSTEM_FILES_TEST_BASE_H_