mojo filesystem: Simplify full file reading/writing.

components/filesystem/directory_impl.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_DIRECTORY_IMPL_H_
 #define COMPONENTS_FILESYSTEM_DIRECTORY_IMPL_H_
 
 #include <stdint.h>
 
 #include "base/files/file_path.h"
@@ skipping 37 matching lines @@
               const mojo::String& new_path,
               const RenameCallback& callback) override;
   void Delete(const mojo::String& path,
               uint32_t delete_flags,
               const DeleteCallback& callback) override;
   void Exists(const mojo::String& path,
               const ExistsCallback& callback) override;
   void IsWritable(const mojo::String& path,
                   const IsWritableCallback& callback) override;
   void Flush(const FlushCallback& callback) override;
+  void ReadEntireFile(const mojo::String& path,
+                      const ReadEntireFileCallback& callback) override;
+  void WriteFile(const mojo::String& path,
+                 mojo::Array<uint8_t> data,
+                 const WriteFileCallback& callback) override;
 
  private:
   mojo::StrongBinding<Directory> binding_;
   base::FilePath directory_path_;
   scoped_ptr<base::ScopedTempDir> temp_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectoryImpl);
 };
 
 }  // namespace filesystem
 
 #endif  // COMPONENTS_FILESYSTEM_DIRECTORY_IMPL_H_