Remove redundant class forward decls that were causing VC++ internal compiler errors.

content/xul/templates/src/nsRuleNetwork.h

@@ -469,8 +469,6 @@ protected:
     List mHead;
 
 public:
-    class Iterator;
-
     class ConstIterator {
     protected:
         friend class Iterator; // XXXwaterson so broken.

content/xul/templates/src/nsXULTemplateBuilder.cpp

@@ -416,8 +416,6 @@ protected:
     enum { kHashTableThreshold = 8 };
 
 public:
-    class Iterator;
-
     class ConstIterator {
     protected:
         friend class Iterator; // XXXwaterson so broken.

rdf/content/src/nsRuleNetwork.h

@@ -469,8 +469,6 @@ protected:
     List mHead;
 
 public:
-    class Iterator;
-
     class ConstIterator {
     protected:
         friend class Iterator; // XXXwaterson so broken.

rdf/content/src/nsXULTemplateBuilder.cpp

@@ -416,8 +416,6 @@ protected:
     enum { kHashTableThreshold = 8 };
 
 public:
-    class Iterator;
-
     class ConstIterator {
     protected:
         friend class Iterator; // XXXwaterson so broken.