Migrate chrome/browser files to histogram_macros.h includes.

chrome/browser/mod_pagespeed/mod_pagespeed_metrics.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 "chrome/browser/mod_pagespeed/mod_pagespeed_metrics.h"
 
 #include <stdio.h>
 
 #include <string>
 
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/metrics/sparse_histogram.h"
 #include "net/http/http_response_headers.h"
 #include "url/gurl.h"
 
 namespace mod_pagespeed {
 
 namespace {
 
 const char kModPagespeedHeader[] = "X-Mod-Pagespeed";
 const char kPageSpeedHeader[] = "X-Page-Speed";
@@ skipping 112 matching lines @@
                                     PAGESPEED_UNKNOWN_SERVER,
                                     PAGESPEED_SERVER_MAXIMUM);
         }
       }
       break;
     }
   }
 }
 
 }  // namespace mod_pagespeed