[downloads] Remove DownloadManager::RemoveAllDownloads.

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 9ae1b002c0e91fcbec51ae575385d0045e664f21..9cb8e1e8794c42f8bb2cd6c4234594f0e2aab968 100644
--- a/content/browser/download/download_stats.cc
+++ b/content/browser/download/download_stats.cc
@@ -693,14 +693,6 @@ void RecordOpen(const base::Time& end, bool first) {
   }
 }
 
-void RecordClearAllSize(int size) {
-  UMA_HISTOGRAM_CUSTOM_COUNTS("Download.ClearAllSize",
-                              size,
-                              1/*min*/,
-                              (1 << 10)/*max*/,
-                              32/*num_buckets*/);
-}
-
 void RecordOpensOutstanding(int size) {
   UMA_HISTOGRAM_CUSTOM_COUNTS("Download.OpensOutstanding",
                               size,