Include only stuff you need, part 6: Fix cctest.h.

test/cctest/test-object.cc

Index: test/cctest/test-object.cc
diff --git a/test/cctest/test-object.cc b/test/cctest/test-object.cc
index e078bfcdb06f2c01dfc95f25444946ec109c243c..396318121aa4e5dc1a83798e6db052afb57e99c5 100644
--- a/test/cctest/test-object.cc
+++ b/test/cctest/test-object.cc
@@ -2,8 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "src/factory.h"
+#include "src/handles-inl.h"
+#include "src/handles.h"
+#include "src/isolate.h"
+#include "src/objects.h"
 #include "src/v8.h"
-
 #include "test/cctest/cctest.h"
 
 using namespace v8::internal;