Migrate content/ files to histogram_macros.h includes.

content/common/cross_site_document_classifier.cc

 // Copyright 2015 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 "content/common/cross_site_document_classifier.h"
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/macros.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/strings/string_util.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/resource_response_info.h"
 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
 #include "net/http/http_response_headers.h"
 
 using base::StringPiece;
 
 namespace content {
 
@@ skipping 216 matching lines @@
       case kColonState:
       case kTerminalState:
         NOTREACHED();
         break;
     }
   }
   return state == kColonState;
 }
 
 }  // namespace content