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

net/socket/socket.h

Index: net/socket/socket.h
diff --git a/net/socket/socket.h b/net/socket/socket.h
index fccb25873a452a85d788f93aef323e0148c30bd8..5d9af81f20588d6e421b78c7598aa16755f9b1e8 100644
--- a/net/socket/socket.h
+++ b/net/socket/socket.h
@@ -48,13 +48,13 @@ class NET_EXPORT Socket {
 
   // Set the receive buffer size (in bytes) for the socket.
   // Note: changing this value can affect the TCP window size on some platforms.
-  // Returns true on success, or false on failure.
-  virtual bool SetReceiveBufferSize(int32 size) = 0;
+  // Returns a net error code.
+  virtual int SetReceiveBufferSize(int32 size) = 0;
 
   // Set the send buffer size (in bytes) for the socket.
   // Note: changing this value can affect the TCP window size on some platforms.
-  // Returns true on success, or false on failure.
-  virtual bool SetSendBufferSize(int32 size) = 0;
+  // Returns a net error code.
+  virtual int SetSendBufferSize(int32 size) = 0;
 };
 
 }  // namespace net