Makes a handful of DataSources not replace the existing

chrome/browser/dom_ui/web_ui_favicon_source.h

Index: chrome/browser/dom_ui/web_ui_favicon_source.h
diff --git a/chrome/browser/dom_ui/web_ui_favicon_source.h b/chrome/browser/dom_ui/web_ui_favicon_source.h
index 1808128d124f24757e529e575c631261ed1317de..05007c15bd07774d7f2f5a7209a0b9a4f1401f79 100644
--- a/chrome/browser/dom_ui/web_ui_favicon_source.h
+++ b/chrome/browser/dom_ui/web_ui_favicon_source.h
@@ -30,6 +30,9 @@ class WebUIFavIconSource : public ChromeURLDataManager::DataSource {
 
   virtual std::string GetMimeType(const std::string&) const;
 
+  virtual bool ShouldReplaceExistingSource() const;
+
+ private:
   // Called when favicon data is available from the history backend.
   void OnFavIconDataAvailable(FaviconService::Handle request_handle,
                               bool know_favicon,
@@ -37,7 +40,6 @@ class WebUIFavIconSource : public ChromeURLDataManager::DataSource {
                               bool expired,
                               GURL url);
 
- private:
   // Sends the default favicon.
   void SendDefaultResponse(int request_id);