Replace IOSurfaceManager by directly passing IOSurface Mach ports over Chrome IPC.

ui/gfx/mac/io_surface_manager.h

Index: ui/gfx/mac/io_surface_manager.h
diff --git a/ui/gfx/mac/io_surface_manager.h b/ui/gfx/mac/io_surface_manager.h
deleted file mode 100644
index 130214c3684ccce7976f7f319bf115a3a639bd85..0000000000000000000000000000000000000000
--- a/ui/gfx/mac/io_surface_manager.h
+++ /dev/null
@@ -1,50 +0,0 @@
-// 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 CONTENT_COMMON_MAC_IO_SURFACE_MANAGER_H_
-#define CONTENT_COMMON_MAC_IO_SURFACE_MANAGER_H_
-
-#include <IOSurface/IOSurface.h>
-
-#include "ui/gfx/buffer_types.h"
-#include "ui/gfx/generic_shared_memory_id.h"
-#include "ui/gfx/geometry/size.h"
-#include "ui/gfx/gfx_export.h"
-
-namespace gfx {
-
-using IOSurfaceId = GenericSharedMemoryId;
-
-// This interface provides a mechanism for different processes to securely
-// share IOSurfaces. A process can register an IOSurface for use in another
-// process and the client ID provided with registration determines the process
-// that can acquire a reference to the IOSurface.
-class GFX_EXPORT IOSurfaceManager {
- public:
-  static IOSurfaceManager* GetInstance();
-  static void SetInstance(IOSurfaceManager* instance);
-
-  // Helper function to create an IOSurface with a specified size and format.
-  static IOSurfaceRef CreateIOSurface(const Size& size, BufferFormat format);
-
-  // Register an IO surface for use in another process.
-  virtual bool RegisterIOSurface(IOSurfaceId io_surface_id,
-                                 int client_id,
-                                 IOSurfaceRef io_surface) = 0;
-
-  // Unregister an IO surface previously registered for use in another
-  // process.
-  virtual void UnregisterIOSurface(IOSurfaceId io_surface_id,
-                                   int client_id) = 0;
-
-  // Acquire IO surface reference for a registered IO surface.
-  virtual IOSurfaceRef AcquireIOSurface(IOSurfaceId io_surface_id) = 0;
-
- protected:
-  virtual ~IOSurfaceManager() {}
-};
-
-}  // namespace content
-
-#endif  // CONTENT_COMMON_MAC_IO_SURFACE_MANAGER_H_