Add WebUIDataSourceImpl::DisableReplaceExistingSource

content/public/browser/web_ui_data_source.h

Index: content/public/browser/web_ui_data_source.h
diff --git a/content/public/browser/web_ui_data_source.h b/content/public/browser/web_ui_data_source.h
index 76d0d7edafbd9561550acca0865b2c6bf534249e..f3692b30a9a9ce6853c18a264e008a41d08cc08b 100644
--- a/content/public/browser/web_ui_data_source.h
+++ b/content/public/browser/web_ui_data_source.h
@@ -78,6 +78,11 @@ class WebUIDataSource {
   // NOTE: it's not acceptable to call DisableContentSecurityPolicy for new
   // pages, see URLDataSource::ShouldAddContentSecurityPolicy and talk to
   // tsepez.
+
+  // Currently only used by embedders for WebUIs with multiple instances, could
+  // have been useful for NTP as well if it wasn't implementing URLDataSource

[jam, 2013/08/25 07:22:39]

nit: please remove everything after the comment. per comment 11 NTP can't use
this, and either way it's a layering violation to mention a chrome concept in
content.

+  // itself.
+  virtual void DisableReplaceExistingSource() = 0;
   virtual void DisableContentSecurityPolicy() = 0;
   virtual void OverrideContentSecurityPolicyObjectSrc(
       const std::string& data) = 0;