mojo filesystem: Further clean ups.

components/filesystem/files_test_base.h

Index: components/filesystem/files_test_base.h
diff --git a/components/filesystem/files_test_base.h b/components/filesystem/files_test_base.h
index 04499496b2b7f54e4c300bf8ba5d6e2767ff1094..8ce96c079f9a426ad5c7b716cc61b0097216209d 100644
--- a/components/filesystem/files_test_base.h
+++ b/components/filesystem/files_test_base.h
@@ -12,8 +12,7 @@
 
 namespace filesystem {
 
-class FilesTestBase : public mojo::test::ApplicationTestBase,
-                      public filesystem::FileSystemClient {
+class FilesTestBase : public mojo::test::ApplicationTestBase {
  public:
   FilesTestBase();
   ~FilesTestBase() override;
@@ -21,9 +20,6 @@ class FilesTestBase : public mojo::test::ApplicationTestBase,
   // 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.
@@ -32,7 +28,6 @@ class FilesTestBase : public mojo::test::ApplicationTestBase,
   FileSystemPtr& files() { return files_; }
 
  private:
-  mojo::Binding<filesystem::FileSystemClient> binding_;
   FileSystemPtr files_;
 
   DISALLOW_COPY_AND_ASSIGN(FilesTestBase);