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

jingle/glue/channel_socket_adapter.h

Index: jingle/glue/channel_socket_adapter.h
diff --git a/jingle/glue/channel_socket_adapter.h b/jingle/glue/channel_socket_adapter.h
index 35414a18d95a6d4a4b70689a1376c3ac24b399ec..fc90df927db9ccbc2fed92c5b5da1ee77b6b14f2 100644
--- a/jingle/glue/channel_socket_adapter.h
+++ b/jingle/glue/channel_socket_adapter.h
@@ -48,8 +48,8 @@ class TransportChannelSocketAdapter : public net::Socket,
   virtual int Write(net::IOBuffer* buf, int buf_len,
                     const net::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;
 
  private:
   void OnNewPacket(cricket::TransportChannel* channel,