Use factory to create histograms, and refcounts to track lifetimes...

net/ftp/ftp_network_transaction.cc

 // Copyright (c) 2008 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/ftp/ftp_network_transaction.h"
 
 #include "base/compiler_specific.h"
 #include "base/histogram.h"
 #include "base/string_util.h"
 #include "net/base/connection_type_histograms.h"
@@ skipping 1144 matching lines @@
       type = NET_ERROR_CONNECTION_BROKEN;
       break;
     case ERR_CONNECTION_REFUSED:
       type = NET_ERROR_CONNECTION_REFUSED;
       break;
     default:
       type = NET_ERROR_OTHER;
       break;
   };
   static bool had_error_type[NUM_OF_NET_ERROR_TYPES];
-  static LinearHistogram error_flagged("Net.FtpDataConnectionErrorHappened",
-                                       1, NUM_OF_NET_ERROR_TYPES,
-                                       NUM_OF_NET_ERROR_TYPES + 1);
-  static LinearHistogram error_counter("Net.FtpDataConnectionErrorCount",
-                                       1, NUM_OF_NET_ERROR_TYPES,
-                                       NUM_OF_NET_ERROR_TYPES + 1);
+  static scoped_refptr<Histogram> error_flagged =
+      LinearHistogram::LinearHistogramFactoryGet(
+          "Net.FtpDataConnectionErrorHappened",
+          1, NUM_OF_NET_ERROR_TYPES, NUM_OF_NET_ERROR_TYPES + 1);
+  static scoped_refptr<Histogram> error_counter =
+      LinearHistogram::LinearHistogramFactoryGet(
+          "Net.FtpDataConnectionErrorCount",
+          1, NUM_OF_NET_ERROR_TYPES, NUM_OF_NET_ERROR_TYPES + 1);
 
   DCHECK(type >= 0 && type < NUM_OF_NET_ERROR_TYPES);
   if (!had_error_type[type]) {
     had_error_type[type] = true;
-    error_flagged.SetFlags(kUmaTargetedHistogramFlag);
-    error_flagged.Add(type);
+    error_flagged->SetFlags(kUmaTargetedHistogramFlag);
+    error_flagged->Add(type);
   }
-  error_counter.SetFlags(kUmaTargetedHistogramFlag);
-  error_counter.Add(type);
+  error_counter->SetFlags(kUmaTargetedHistogramFlag);
+  error_counter->Add(type);
 }
 
 }  // namespace net