Fix some types at the IPC layer. Sizes should be unsigned.

ppapi/proxy/ppb_graphics_3d_proxy.h

 // Copyright (c) 2012 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 PPAPI_PROXY_PPB_GRAPHICS_3D_PROXY_H_
 #define PPAPI_PROXY_PPB_GRAPHICS_3D_PROXY_H_
 
 #include <vector>
 
 #include "base/shared_memory.h"
@@ skipping 78 matching lines @@
                      gpu::CommandBuffer::State* state,
                      bool* success);
   void OnMsgFlush(const HostResource& context,
                   int32 put_offset,
                   int32 last_known_get,
                   gpu::CommandBuffer::State* state,
                   bool* success);
   void OnMsgAsyncFlush(const HostResource& context,
                        int32 put_offset);
   void OnMsgCreateTransferBuffer(const HostResource& context,
-                                 int32 size,
+                                 uint32 size,
                                  int32* id);
   void OnMsgDestroyTransferBuffer(const HostResource& context,
                                   int32 id);
   void OnMsgGetTransferBuffer(const HostResource& context,
                               int32 id,
                               ppapi::proxy::SerializedHandle* transfer_buffer);
   void OnMsgSwapBuffers(const HostResource& context);
   // Renderer->plugin message handlers.
   void OnMsgSwapBuffersACK(const HostResource& context,
                            int32_t pp_error);
 
   void SendSwapBuffersACKToPlugin(int32_t result,
                                   const HostResource& context);
 
   ProxyCompletionCallbackFactory<PPB_Graphics3D_Proxy> callback_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_Graphics3D_Proxy);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PPB_GRAPHICS_3D_PROXY_H_