Make DownloadHistory observe manager, items

content/browser/download/download_stats.cc

Index: content/browser/download/download_stats.cc
diff --git a/content/browser/download/download_stats.cc b/content/browser/download/download_stats.cc
index f1492dd44ee7760453aa8abace94bcfa4cf2bf0d..1f75a77de73cdf533714b69fff83f80aa28898e4 100644
--- a/content/browser/download/download_stats.cc
+++ b/content/browser/download/download_stats.cc
@@ -278,14 +278,6 @@ void RecordOpen(const base::Time& end, bool first) {
   }
 }
 
-void RecordHistorySize(int size) {
-  UMA_HISTOGRAM_CUSTOM_COUNTS("Download.HistorySize2",
-                              size,
-                              0/*min*/,
-                              (1 << 23)/*max*/,
-                              (1 << 7)/*num_buckets*/);
-}
-
 void RecordClearAllSize(int size) {
   UMA_HISTOGRAM_CUSTOM_COUNTS("Download.ClearAllSize",
                               size,