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

ppapi/proxy/ppapi_messages.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.
 
 // Multiply-included message header, no traditional include guard.
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
@@ skipping 895 matching lines @@
                            ppapi::HostResource /* context */,
                            int32 /* put_offset */,
                            int32 /* last_known_get */,
                            gpu::CommandBuffer::State /* state */,
                            bool /* success */)
 IPC_MESSAGE_ROUTED2(PpapiHostMsg_PPBGraphics3D_AsyncFlush,
                     ppapi::HostResource /* context */,
                     int32 /* put_offset */)
 IPC_SYNC_MESSAGE_ROUTED2_1(PpapiHostMsg_PPBGraphics3D_CreateTransferBuffer,
                            ppapi::HostResource /* context */,
-                           int32 /* size */,
+                           uint32 /* size */,
                            int32 /* id */)
 IPC_SYNC_MESSAGE_ROUTED2_0(PpapiHostMsg_PPBGraphics3D_DestroyTransferBuffer,
                            ppapi::HostResource /* context */,
                            int32 /* id */)
 IPC_SYNC_MESSAGE_ROUTED2_1(PpapiHostMsg_PPBGraphics3D_GetTransferBuffer,
                            ppapi::HostResource /* context */,
                            int32 /* id */,
                            ppapi::proxy::SerializedHandle /* transfer_buffer */)
 IPC_MESSAGE_ROUTED1(PpapiHostMsg_PPBGraphics3D_SwapBuffers,
                     ppapi::HostResource /* graphics_3d */)
@@ skipping 308 matching lines @@
 // PPB_VideoDecoder.
 IPC_SYNC_MESSAGE_ROUTED3_1(PpapiHostMsg_PPBVideoDecoder_Create,
                            PP_Instance /* instance */,
                            ppapi::HostResource /* context */,
                            PP_VideoDecoder_Profile /* profile */,
                            ppapi::HostResource /* result */)
 IPC_MESSAGE_ROUTED4(PpapiHostMsg_PPBVideoDecoder_Decode,
                     ppapi::HostResource /* video_decoder */,
                     ppapi::HostResource /* bitstream buffer */,
                     int32 /* bitstream buffer id */,
-                    int32 /* size of buffer */)
+                    uint32 /* size of buffer */)
 IPC_MESSAGE_ROUTED2(PpapiHostMsg_PPBVideoDecoder_AssignPictureBuffers,
                     ppapi::HostResource /* video_decoder */,
                     std::vector<PP_PictureBuffer_Dev> /* picture buffers */)
 IPC_MESSAGE_ROUTED2(PpapiHostMsg_PPBVideoDecoder_ReusePictureBuffer,
                     ppapi::HostResource /* video_decoder */,
                     int32_t /* picture buffer id */)
 IPC_MESSAGE_ROUTED1(PpapiHostMsg_PPBVideoDecoder_Flush,
                     ppapi::HostResource /* video_decoder */)
 IPC_MESSAGE_ROUTED1(PpapiHostMsg_PPBVideoDecoder_Reset,
                     ppapi::HostResource /* video_decoder */)
@@ skipping 467 matching lines @@
                      std::vector<ppapi::HostResource> /* buffers */,
                      uint32_t /* buffer_size */)
 IPC_MESSAGE_CONTROL1(PpapiPluginMsg_VideoCapture_OnStatus,
                      uint32_t /* status */)
 IPC_MESSAGE_CONTROL1(PpapiPluginMsg_VideoCapture_OnError,
                      uint32_t /* error */)
 IPC_MESSAGE_CONTROL1(PpapiPluginMsg_VideoCapture_OnBufferReady,
                      uint32_t /* buffer */)
 
 #endif  // !defined(OS_NACL) && !defined(NACL_WIN64)