Add some comments explaining what these files do. rs=jst

git-svn-id: svn://10.0.0.236/trunk@193256 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/content/base/src/nsDataDocumentContentPolicy.cpp

@@ -35,6 +35,12 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
+/*
+ * Content policy implementation that prevents all loads of images,
+ * subframes, etc from documents loaded as data (eg documents loaded
+ * via XMLHttpRequest).
+ */
+
 #include "nsDataDocumentContentPolicy.h"
 #include "nsIDocument.h"
 #include "nsINode.h"