Adding GetIID methods to the content viewer and document loader.

webshell/public/nsIContentViewerContainer.h

@@ -35,6 +35,7 @@ class nsIContentViewer;
 class nsIContentViewerContainer : public nsISupports
 {
 public:
+  static const nsIID& GetIID() { static nsIID iid = NS_ICONTENT_VIEWER_CONTAINER_IID; return iid; }
 
   NS_IMETHOD QueryCapability(const nsIID &aIID, void** aResult) = 0;
 

webshell/public/nsIDocumentLoader.h

@@ -67,6 +67,8 @@ public:
 class nsIDocumentLoader : public nsISupports 
 {
 public:
+    static const nsIID& GetIID() { static nsIID iid = NS_IDOCUMENTLOADER_IID; return iid; }
+
     NS_IMETHOD LoadDocument(const nsString& aURLSpec, 
                             const char* aCommand,
                             nsIContentViewerContainer* aContainer,