bug 906209 - remove some spurious idl forward-declarations r=jlebar

dom/interfaces/traversal/nsIDOMNodeIterator.idl

@@ -6,10 +6,8 @@
 
 #include "domstubs.idl"
 
-interface nsIDOMNodeIterator;
 interface nsIDOMNodeFilter;
 
-
 [scriptable, uuid(a86bdac9-ff89-4c94-8160-4fe86733bab8)]
 // Introduced in DOM Level 2, updated to DOM Level 4:
 interface nsIDOMNodeIterator : nsISupports

dom/interfaces/traversal/nsIDOMTreeWalker.idl

@@ -6,10 +6,8 @@
 
 #include "domstubs.idl"
 
-interface nsIDOMTreeWalker;
 interface nsIDOMNodeFilter;
 
-
 [scriptable, uuid(c4ffa159-237c-4dde-b0ba-20b9f9270cf6)]
 // Introduced in DOM Level 2:
 interface nsIDOMTreeWalker : nsISupports {

toolkit/profile/nsIToolkitProfile.idl

@@ -6,7 +6,6 @@
 #include "nsISupports.idl"
 
 interface nsIFile;
-interface nsIToolkitProfile;
 interface nsIProfileUnlocker;
 
 /**

xpcom/io/nsILineInputStream.idl

@@ -6,8 +6,6 @@
 
 #include "nsISupports.idl"
 
-interface nsILineInputStream;
-
 [scriptable, uuid(c97b466c-1e6e-4773-a4ab-2b2b3190a7a6)]
 interface nsILineInputStream : nsISupports
 {