Remove several grab-bag includes from the v8.h header.

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"
+
 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) {
   DCHECK(strcmp(*v8::String::Utf8Value(str), "getV8Statistics") == 0);
@@ skipping 115 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