Fix compile errors on Windows and Mac introduced by r10093.

test/cctest/test-heap.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 
 #include <stdlib.h>
 
 #include "v8.h"
 
 #include "execution.h"
 #include "factory.h"
 #include "macro-assembler.h"
 #include "global-handles.h"
@@ skipping 1295 matching lines @@
                        "  }"
                        "  return C[n][m];"
                        "};"
                        "binom(1000, 500)";
   {
     AlwaysAllocateScope aa_scope;
     CompileRun(source);
   }
   intptr_t old_size = HEAP->SizeOfObjects();
   bool no_idle_work = v8::V8::IdleNotification();
-  while (!v8::V8::IdleNotification());
+  while (!v8::V8::IdleNotification()) ;
   intptr_t new_size = HEAP->SizeOfObjects();
   CHECK(no_idle_work || new_size < 3 * old_size / 4);
 }