Change mojo geometry structs from using type converters to StructTraits.

components/mus/ws/display.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_MUS_WS_DISPLAY_H_
 #define COMPONENTS_MUS_WS_DISPLAY_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 117 matching lines @@
   void UpdateTextInputState(ServerWindow* window,
                             const ui::TextInputState& state);
   void SetImeVisibility(ServerWindow* window, bool visible);
 
   // Called just before |tree| is destroyed.
   void OnWillDestroyTree(WindowTree* tree);
 
   void UpdateNativeCursor(int32_t cursor_id);
 
   // mojom::WindowTreeHost:
-  void SetSize(mojo::SizePtr size) override;
+  void SetSize(const gfx::Size& size) override;
   void SetTitle(const mojo::String& title) override;
 
  private:
   friend class test::DisplayTestApi;
 
   using WindowManagerStateMap =
       std::map<UserId, std::unique_ptr<WindowManagerState>>;
 
   // Inits the necessary state once the display is ready.
   void InitWindowManagersIfNecessary();
@@ skipping 56 matching lines @@
 
   WindowManagerStateMap window_manager_state_map_;
 
   DISALLOW_COPY_AND_ASSIGN(Display);
 };
 
 }  // namespace ws
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_DISPLAY_H_