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

chrome/browser/renderer_host/buffered_resource_handler.cc

Index: chrome/browser/renderer_host/buffered_resource_handler.cc
===================================================================
--- chrome/browser/renderer_host/buffered_resource_handler.cc	(revision 33932)
+++ chrome/browser/renderer_host/buffered_resource_handler.cc	(working copy)
@@ -30,18 +30,23 @@
 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());
   }
 }