Remove grab-bag includes of v8.h from everywhere.

src/extensions/statistics-extension.cc

 // Copyright 2012 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/extensions/statistics-extension.h"
 
-#include "src/v8.h"
+#include "src/counters.h"
+#include "src/heap/heap-inl.h"
+#include "src/isolate.h"
+#include "src/objects-inl.h"  // TODO(mstarzinger): Temporary cycle breaker!
 
 namespace v8 {
 namespace internal {
 
 const char* const StatisticsExtension::kSource =
     "native function getV8Statistics();";
 
 
 v8::Local<v8::FunctionTemplate> StatisticsExtension::GetNativeFunctionTemplate(
     v8::Isolate* isolate, v8::Local<v8::String> str) {
@@ skipping 116 matching lines @@
   }
 
   AddNumber64(args.GetIsolate(), result,
               heap->amount_of_external_allocated_memory(),
               "amount_of_external_allocated_memory");
   args.GetReturnValue().Set(result);
 }
 
 }  // namespace internal
 }  // namespace v8