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

jingle/glue/proxy_resolving_client_socket.h

Index: jingle/glue/proxy_resolving_client_socket.h
diff --git a/jingle/glue/proxy_resolving_client_socket.h b/jingle/glue/proxy_resolving_client_socket.h
index 99824d09e596103beda7763ae9e3caf158dfc27b..58bbdba4d264e2dcfb349512fef5adc618a7d91e 100644
--- a/jingle/glue/proxy_resolving_client_socket.h
+++ b/jingle/glue/proxy_resolving_client_socket.h
@@ -52,8 +52,8 @@ class ProxyResolvingClientSocket : public net::StreamSocket {
                    const net::CompletionCallback& callback) OVERRIDE;
   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;
   virtual int Connect(const net::CompletionCallback& callback) OVERRIDE;
   virtual void Disconnect() OVERRIDE;
   virtual bool IsConnected() const OVERRIDE;