Fix http://codereview.chromium.org/6869009 to ignore an existing object exactly once and land the...

net/disk_cache/stats_histogram.cc

Index: net/disk_cache/stats_histogram.cc
===================================================================
--- net/disk_cache/stats_histogram.cc	(revision 86987)
+++ net/disk_cache/stats_histogram.cc	(working copy)
@@ -4,6 +4,7 @@
 
 #include "net/disk_cache/stats_histogram.h"
 
+#include "base/debug/leak_annotations.h"
 #include "base/logging.h"
 #include "net/disk_cache/stats.h"
 
@@ -21,8 +22,7 @@
     stats_ = NULL;
 }
 
-StatsHistogram* StatsHistogram::StatsHistogramFactoryGet(
-    const std::string& name) {
+StatsHistogram* StatsHistogram::FactoryGet(const std::string& name) {
   Histogram* histogram(NULL);
 
   Sample minimum = 1;
@@ -38,6 +38,8 @@
     stats_histogram->InitializeBucketRange();
     stats_histogram->SetFlags(kUmaTargetedHistogramFlag);
     histogram = StatisticsRecorder::RegisterOrDeleteDuplicate(stats_histogram);
+    if (histogram == stats_histogram)
+        ANNOTATE_LEAKING_OBJECT_PTR(return_histogram); // see crbug.com/79322
   }
 
   DCHECK(HISTOGRAM == histogram->histogram_type());