Attempt four at landing the "histogram.h removed from message_loop.h" patch.

net/base/net_log.cc

 // Copyright (c) 2010 The Chromium 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 "net/base/net_log.h"
 #include "base/string_util.h"
+#include "base/time.h"
 #include "base/values.h"
 
 namespace net {
 
 // static
 const char* NetLog::EventTypeToString(EventType event) {
   switch (event) {
 #define EVENT_TYPE(label) case TYPE_ ## label: return #label;
 #include "net/base/net_log_event_type_list.h"
 #undef EVENT_TYPE
@@ skipping 85 matching lines @@
 
   DictionaryValue* source_dict = new DictionaryValue();
   source_dict->SetInteger(L"type", static_cast<int>(value_.type));
   source_dict->SetInteger(L"id", static_cast<int>(value_.id));
 
   dict->Set(ASCIIToWide(name_), source_dict);
   return dict;
 }
 
 }  // namespace net