mus: Remove window server access to clipboard and the drag clipboard.

services/ui/clipboard/clipboard_impl.h

 // Copyright 2016 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 SERVICES_UI_CLIPBOARD_CLIPBOARD_IMPL_H_
 #define SERVICES_UI_CLIPBOARD_CLIPBOARD_IMPL_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/macros.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/ui/public/interfaces/clipboard.mojom.h"
 
 namespace ui {
 namespace clipboard {
 
 // Stub clipboard implementation.
 //
 // Eventually, we'll actually want to interact with the system clipboard, but
 // that's hard today because the system clipboard is asynchronous (on X11), the
 // ui::Clipboard interface is synchronous (which is what we'd use), mojo is
 // asynchronous across processes, and the WebClipboard interface is synchronous
 // (which is at least tractable).
 class ClipboardImpl : public mojom::Clipboard {
  public:
   // mojom::Clipboard exposes three possible clipboards.
-  static const int kNumClipboards = 3;
+  static const int kNumClipboards = 2;
 
   ClipboardImpl();
   ~ClipboardImpl() override;
 
   void AddBinding(mojom::ClipboardRequest request);
 
   // mojom::Clipboard implementation.
   void GetSequenceNumber(
       mojom::Clipboard::Type clipboard_type,
       const GetSequenceNumberCallback& callback) override;
@@ skipping 16 matching lines @@
   std::unique_ptr<ClipboardData> clipboard_state_[kNumClipboards];
   mojo::BindingSet<mojom::Clipboard> bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(ClipboardImpl);
 };
 
 }  // namespace clipboard
 }  // namespace ui
 
 #endif  // SERVICES_UI_CLIPBOARD_CLIPBOARD_IMPL_H_