Clean up sparse_histogram.h header

components/safe_browsing_db/prefix_set.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 "components/safe_browsing_db/prefix_set.h"
 
 #include <limits.h>
 
 #include <algorithm>
 #include <utility>
 
 #include "base/files/file_util.h"
 #include "base/files/scoped_file.h"
 #include "base/logging.h"
 #include "base/md5.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram.h"
-#include "base/metrics/sparse_histogram.h"
+#include "base/metrics/histogram_macros.h"
 
 namespace safe_browsing {
 
 namespace {
 
 // |kMagic| should be reasonably unique, and not match itself across
 // endianness changes.  I generated this value with:
 // md5 -qs chrome/browser/safe_browsing/prefix_set.cc | colrm 9
 static uint32_t kMagic = 0x864088dd;
 
@@ skipping 415 matching lines @@
   }
   buffer_.push_back(prefix);
 
   // Flush buffer when a run can be constructed.  +1 for the index item, and +1
   // to leave at least one item in the buffer for dropping duplicates.
   if (buffer_.size() > PrefixSet::kMaxRun + 2)
     EmitRun();
 }
 
 }  // namespace safe_browsing