Change includes of histogram.h to histogram_macros.h.

content/browser/appcache/appcache_histograms.cc

 // Copyright (c) 2012 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/browser/appcache/appcache_histograms.h"
 
 #include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "content/public/common/origin_util.h"
 
 namespace content {
 
 static std::string OriginToCustomHistogramSuffix(const GURL& origin_url) {
   if (origin_url.host_piece() == "docs.google.com")
     return ".Docs";
   return std::string();
 }
 
@@ skipping 131 matching lines @@
 }
 
 void AppCacheHistograms::AddMissingManifestDetectedAtCallsite(
     MissingManifestCallsiteType callsite) {
   UMA_HISTOGRAM_ENUMERATION(
        "appcache.MissingManifestDetectedAtCallsite",
        callsite, NUM_MISSING_MANIFEST_CALLSITE_TYPES);
 }
 
 }  // namespace content