Isolate initiation counts for downloads to their own histograms and improve

chrome/browser/chromeos/imageburner/burn_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/imageburner/burn_manager.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
@@ skipping 407 matching lines @@
                                      WebContents* web_contents,
                                      net::FileStream* file_stream) {
   if (file_stream) {
     DownloadManager* download_manager =
         web_contents->GetBrowserContext()->GetDownloadManager();
     DownloadSaveInfo save_info;
     save_info.file_path = file_path;
     save_info.file_stream = linked_ptr<net::FileStream>(file_stream);
     DownloadStarted(true, url);
 
-    download_util::RecordDownloadCount(
-        download_util::INITIATED_BY_IMAGE_BURNER_COUNT);
+    download_util::RecordDownloadSource(
+        download_util::INITIATED_BY_IMAGE_BURNER);
     download_manager->DownloadUrl(
         url,
         web_contents->GetURL(),
         web_contents->GetEncoding(),
         false,
         -1,
         save_info,
         web_contents);
   } else {
     DownloadStarted(false, url);
@@ skipping 11 matching lines @@
        current_listener != listener_range.second;
        ++current_listener) {
     if (current_listener->second)
       current_listener->second->OnBurnDownloadStarted(success);
   }
   listeners_.erase(listener_range.first, listener_range.second);
 }
 
 }  // namespace imageburner
 }  // namespace chromeos