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

ppapi/proxy/ppb_graphics_3d_proxy.cc

 // 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.
 
 #include "ppapi/proxy/ppb_graphics_3d_proxy.h"
 
 #include "gpu/command_buffer/client/gles2_implementation.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/proxy/enter_proxy.h"
@@ skipping 431 matching lines @@
 
 void PPB_Graphics3D_Proxy::OnMsgAsyncFlush(const HostResource& context,
                                            int32 put_offset) {
   EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
   if (enter.succeeded())
     enter.object()->Flush(put_offset);
 }
 
 void PPB_Graphics3D_Proxy::OnMsgCreateTransferBuffer(
     const HostResource& context,
-    int32 size,
+    uint32 size,
     int32* id) {
   EnterHostFromHostResource<PPB_Graphics3D_API> enter(context);
   if (enter.succeeded())
     *id = enter.object()->CreateTransferBuffer(size);
   else
     *id = 0;
 }
 
 void PPB_Graphics3D_Proxy::OnMsgDestroyTransferBuffer(
     const HostResource& context,
@@ skipping 41 matching lines @@
     int32_t result,
     const HostResource& context) {
   dispatcher()->Send(new PpapiMsg_PPBGraphics3D_SwapBuffersACK(
       API_ID_PPB_GRAPHICS_3D, context, result));
 }
 #endif  // !defined(OS_NACL)
 
 }  // namespace proxy
 }  // namespace ppapi