Factor interfaces into individual .idl files.

content/xul/document/src/nsXULDocument.cpp

@@ -58,6 +58,7 @@
 #include "nsIPresContext.h"
 #include "nsIPresShell.h"
 #include "nsIRDFCompositeDataSource.h"
+#include "nsIRDFContainerUtils.h"
 #include "nsIRDFContentModelBuilder.h"
 #include "nsIRDFDataSource.h"
 #include "nsIRDFDocument.h"

rdf/content/src/nsRDFGenericBuilder.h

@@ -23,7 +23,8 @@
   content model that is to be used with a certain widget.  This class
   is abstract.
  */
- 
+
+#include "nsIRDFContainerUtils.h" 
 #include "nsIRDFContentModelBuilder.h"
 #include "nsIRDFObserver.h"
 #include "nsIDOMNodeObserver.h"

rdf/content/src/nsRDFXULBuilder.cpp

@@ -48,6 +48,7 @@
 #include "nsINameSpaceManager.h"
 #include "nsIRDFCompositeDataSource.h"
 #include "nsIRDFContainer.h"
+#include "nsIRDFContainerUtils.h"
 #include "nsIRDFContentModelBuilder.h"
 #include "nsIRDFDocument.h"
 #include "nsIRDFNode.h"

rdf/content/src/nsXULDocument.cpp

@@ -58,6 +58,7 @@
 #include "nsIPresContext.h"
 #include "nsIPresShell.h"
 #include "nsIRDFCompositeDataSource.h"
+#include "nsIRDFContainerUtils.h"
 #include "nsIRDFContentModelBuilder.h"
 #include "nsIRDFDataSource.h"
 #include "nsIRDFDocument.h"