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

test/cctest/heap/test-array-buffer-tracker.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "src/api.h"
 #include "src/heap/array-buffer-tracker.h"
+#include "src/isolate.h"
 #include "test/cctest/cctest.h"
 #include "test/cctest/heap/heap-utils.h"
 
 namespace {
 
 typedef i::LocalArrayBufferTracker LocalTracker;
 
 bool IsTracked(i::JSArrayBuffer* buf) {
   return i::ArrayBufferTracker::IsTracked(buf);
 }
@@ skipping 293 matching lines @@
     Local<v8::ArrayBuffer> ab2 = v8::ArrayBuffer::New(isolate, 100);
     Handle<JSArrayBuffer> buf2 = v8::Utils::OpenHandle(*ab2);
     CHECK_NE(Page::FromAddress(buf1->address()),
              Page::FromAddress(buf2->address()));
     heap::GcAndSweep(heap, OLD_SPACE);
   }
 }
 
 }  // namespace internal
 }  // namespace v8