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

test/cctest/test-date.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
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+#include "src/date.h"
+#include "src/global-handles.h"
+#include "src/isolate.h"
 #include "src/v8.h"
-
-#include "src/global-handles.h"
 #include "test/cctest/cctest.h"
 
 using namespace v8::internal;
 
 class DateCacheMock: public DateCache {
  public:
   struct Rule {
     int year, start_month, start_day, end_month, end_day, offset_sec;
   };
 
@@ skipping 167 matching lines @@
   CHECK_EQ(0.0, date_cache_version->NumberValue(context).FromMaybe(-1.0));
 
   v8::Date::DateTimeConfigurationChangeNotification(isolate);
 
   date_cache_version =
       v8::Local<v8::Number>::Cast(CompileRun("%DateCacheVersion()"));
   CHECK(date_cache_version->IsNumber());
   CHECK_EQ(1.0, date_cache_version->NumberValue(context).FromMaybe(-1.0));
 }
 #endif  // V8_I18N_SUPPORT