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

ui/views/mus/clipboard_mus.cc

 // 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.
 
 #include "ui/views/mus/clipboard_mus.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "mojo/common/common_type_converters.h"
 #include "mojo/public/cpp/bindings/sync_call_restrictions.h"
 #include "services/shell/public/cpp/connector.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/base/clipboard/custom_data_helper.h"
 #include "ui/gfx/codec/png_codec.h"
 
 namespace views {
 namespace {
 
 ui::mojom::Clipboard::Type GetType(ui::ClipboardType type) {
   switch (type) {
     case ui::CLIPBOARD_TYPE_COPY_PASTE:
       return ui::mojom::Clipboard::Type::COPY_PASTE;
     case ui::CLIPBOARD_TYPE_SELECTION:
       return ui::mojom::Clipboard::Type::SELECTION;
     case ui::CLIPBOARD_TYPE_DRAG:
-      return ui::mojom::Clipboard::Type::DRAG;
+      // Only OSX uses a drag clipboard.
+      break;
   }
 
   NOTREACHED();
   return ui::mojom::Clipboard::Type::COPY_PASTE;
 }
 
 // The source URL of copied HTML.
 const char kInternalSourceURL[] = "chromium/internal-url";
 
 }  // namespace
@@ skipping 291 matching lines @@
 void ClipboardMus::WriteData(const FormatType& format,
                              const char* data_data,
                              size_t data_len) {
   DCHECK(current_clipboard_);
   current_clipboard_->insert(
       GetMimeTypeFor(format),
       mojo::Array<uint8_t>::From(base::StringPiece(data_data, data_len)));
 }
 
 }  // namespace views