make SetReceiveBufferSize and SetSendBufferSize return net error codes (instead of bools)

net/socket/buffered_write_stream_socket.h

Index: net/socket/buffered_write_stream_socket.h
diff --git a/net/socket/buffered_write_stream_socket.h b/net/socket/buffered_write_stream_socket.h
index 803018eefe3578b44706276eb10eae63e0c083d5..8eb94f3efd03cfd4db293c7c6fd1bf592837215c 100644
--- a/net/socket/buffered_write_stream_socket.h
+++ b/net/socket/buffered_write_stream_socket.h
@@ -43,8 +43,8 @@ class NET_EXPORT_PRIVATE BufferedWriteStreamSocket : public StreamSocket {
                    const CompletionCallback& callback) OVERRIDE;
   virtual int Write(IOBuffer* buf, int buf_len,
                     const CompletionCallback& callback) OVERRIDE;
-  virtual bool SetReceiveBufferSize(int32 size) OVERRIDE;
-  virtual bool SetSendBufferSize(int32 size) OVERRIDE;
+  virtual int SetReceiveBufferSize(int32 size) OVERRIDE;
+  virtual int SetSendBufferSize(int32 size) OVERRIDE;
 
   // StreamSocket interface
   virtual int Connect(const CompletionCallback& callback) OVERRIDE;