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

net/dns/address_sorter_posix_unittest.cc

Index: net/dns/address_sorter_posix_unittest.cc
diff --git a/net/dns/address_sorter_posix_unittest.cc b/net/dns/address_sorter_posix_unittest.cc
index c45173799579d129c64103d32520cebf0fc1ce38..dea7ade0fea9a559d88f1d6bba06322e3e1333e2 100644
--- a/net/dns/address_sorter_posix_unittest.cc
+++ b/net/dns/address_sorter_posix_unittest.cc
@@ -43,11 +43,11 @@ class TestUDPClientSocket : public DatagramClientSocket {
     NOTIMPLEMENTED();
     return OK;
   }
-  virtual bool SetReceiveBufferSize(int32) OVERRIDE {
-    return true;
+  virtual int SetReceiveBufferSize(int32) OVERRIDE {
+    return OK;
   }
-  virtual bool SetSendBufferSize(int32) OVERRIDE {
-    return true;
+  virtual int SetSendBufferSize(int32) OVERRIDE {
+    return OK;
   }
 
   virtual void Close() OVERRIDE {}