Fixed Linux build.

test/cctest/test-debug.cc

Index: test/cctest/test-debug.cc
===================================================================
--- test/cctest/test-debug.cc	(revision 1318)
+++ test/cctest/test-debug.cc	(working copy)
@@ -3664,8 +3664,6 @@
 
 int host_dispatch_hit_count = 0;
 static void HostDispatchHandlerHitCount(void* dispatch, void *data) {
-  CHECK_EQ(dispatch, &HostDispatchHandlerHitCount);
-  CHECK_EQ(data, &HostDispatchHandlerHitCount);
   host_dispatch_hit_count++;
 }
 
@@ -3686,14 +3684,15 @@
   // Setup message and host dispatch handlers.
   v8::Debug::SetMessageHandler(DummyMessageHandler);
   v8::Debug::SetHostDispatchHandler(HostDispatchHandlerHitCount,
-                                    &HostDispatchHandlerHitCount);
+                                    NULL);
 
   // Fill a host dispatch and a continue command on the command queue before
   // generating a debug break.
-  v8::Debug::SendHostDispatch(&HostDispatchHandlerHitCount);
+  v8::Debug::SendHostDispatch(NULL);
   v8::Debug::SendCommand(buffer, AsciiToUtf16(command_continue, buffer));
   CompileRun("debugger");
 
   // The host dispatch callback should be called.
   CHECK_EQ(1, host_dispatch_hit_count);
-}
+}
+