Isolate initiation counts for downloads to their own histograms and improve

chrome/browser/tab_contents/render_view_context_menu.cc

Index: chrome/browser/tab_contents/render_view_context_menu.cc
diff --git a/chrome/browser/tab_contents/render_view_context_menu.cc b/chrome/browser/tab_contents/render_view_context_menu.cc
index b3dfdcccce8eccf59867e48cfda937fb47e7a7e7..d0784d97362939db647d6078116653fd164a3fc3 100644
--- a/chrome/browser/tab_contents/render_view_context_menu.cc
+++ b/chrome/browser/tab_contents/render_view_context_menu.cc
@@ -1502,8 +1502,8 @@ void RenderViewContextMenu::ExecuteCommand(int id, int event_flags) {
       break;
 
     case IDC_CONTENT_CONTEXT_SAVELINKAS: {
-      download_util::RecordDownloadCount(
-          download_util::INITIATED_BY_CONTEXT_MENU_COUNT);
+      download_util::RecordDownloadSource(
+          download_util::INITIATED_BY_CONTEXT_MENU);
       const GURL& referrer =
           params_.frame_url.is_empty() ? params_.page_url : params_.frame_url;
       const GURL& url = params_.link_url;
@@ -1523,8 +1523,8 @@ void RenderViewContextMenu::ExecuteCommand(int id, int event_flags) {
 
     case IDC_CONTENT_CONTEXT_SAVEAVAS:
     case IDC_CONTENT_CONTEXT_SAVEIMAGEAS: {
-      download_util::RecordDownloadCount(
-          download_util::INITIATED_BY_CONTEXT_MENU_COUNT);
+      download_util::RecordDownloadSource(
+          download_util::INITIATED_BY_CONTEXT_MENU);
       const GURL& referrer =
           params_.frame_url.is_empty() ? params_.page_url : params_.frame_url;
       const GURL& url = params_.src_url;