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

chrome/browser/renderer_host/buffered_resource_handler.cc

 // Copyright (c) 2009 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/renderer_host/buffered_resource_handler.h"
 
 #include <vector>
 
 #include "base/histogram.h"
 #include "base/logging.h"
@@ skipping 12 matching lines @@
 #include "net/http/http_response_headers.h"
 #include "webkit/glue/plugins/plugin_list.h"
 
 namespace {
 
 const int kMaxBytesToSniff = 512;
 
 void RecordSnifferMetrics(bool sniffing_blocked,
                           bool we_would_like_to_sniff,
                           const std::string& mime_type) {
-  static BooleanHistogram nosniff_usage("nosniff.usage");
-  nosniff_usage.SetFlags(kUmaTargetedHistogramFlag);
-  nosniff_usage.AddBoolean(sniffing_blocked);
+  static scoped_refptr<Histogram> nosniff_usage =
+      BooleanHistogram::BooleanHistogramFactoryGet("nosniff.usage");
+  nosniff_usage->SetFlags(kUmaTargetedHistogramFlag);
+  nosniff_usage->AddBoolean(sniffing_blocked);
 
   if (sniffing_blocked) {
-    static BooleanHistogram nosniff_otherwise("nosniff.otherwise");
-    nosniff_otherwise.SetFlags(kUmaTargetedHistogramFlag);
-    nosniff_otherwise.AddBoolean(we_would_like_to_sniff);
+    static scoped_refptr<Histogram> nosniff_otherwise =
+        BooleanHistogram::BooleanHistogramFactoryGet(
+            "nosniff.otherwise");
+    nosniff_otherwise->SetFlags(kUmaTargetedHistogramFlag);
+    nosniff_otherwise->AddBoolean(we_would_like_to_sniff);
 
-    static BooleanHistogram nosniff_empty_mime_type("nosniff.empty_mime_type");
-    nosniff_empty_mime_type.SetFlags(kUmaTargetedHistogramFlag);
-    nosniff_empty_mime_type.AddBoolean(mime_type.empty());
+    static scoped_refptr<Histogram> nosniff_empty_mime_type =
+        BooleanHistogram::BooleanHistogramFactoryGet(
+            "nosniff.empty_mime_type");
+    nosniff_empty_mime_type->SetFlags(kUmaTargetedHistogramFlag);
+    nosniff_empty_mime_type->AddBoolean(mime_type.empty());
   }
 }
 
 }  // namespace
 
 BufferedResourceHandler::BufferedResourceHandler(ResourceHandler* handler,
                                                  ResourceDispatcherHost* host,
                                                  URLRequest* request)
     : real_handler_(handler),
       host_(host),
@@ skipping 424 matching lines @@
   wait_for_plugins_ = false;
   if (!request_)
     return;
 
   ResourceDispatcherHostRequestInfo* info =
       ResourceDispatcherHost::InfoForRequest(request_);
   host_->PauseRequest(info->child_id(), info->request_id(), false);
   if (!CompleteResponseStarted(info->request_id(), false))
     host_->CancelRequest(info->child_id(), info->request_id(), false);
 }