Bug 1216885 - Make nsISelectionPrivate not inherit from nsISelection. r=smaug

nsISelectionPrivate is accessible to script, while nsISelection is
not, so making the former inherit from the latter means script doesn't
have a complete view of the inheritance chain so the XPIDL compiler
produces an error.

It turns out that nothing in script relies on this inheritance, which
makes sense because I'm not sure how it would even work, so just
remove it.

MozReview-Commit-ID: 3Py2T7cprlD

--HG--
extra : rebase_source : 89fac3ad0f7a30c1c71da79d554ebfa153d5fb33

dom/base/Selection.h

@@ -56,8 +56,9 @@ struct RangeData
 namespace mozilla {
 namespace dom {
 
-class Selection final : public nsISelectionPrivate,
+class Selection final : public nsISelection,
                         public nsWrapperCache,
+                        public nsISelectionPrivate,
                         public nsSupportsWeakReference
 {
 protected:
@@ -68,7 +69,7 @@ public:
   explicit Selection(nsFrameSelection *aList);
 
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
-  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(Selection, nsISelectionPrivate)
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(Selection, nsISelection)
   NS_DECL_NSISELECTION
   NS_DECL_NSISELECTIONPRIVATE
 

dom/base/nsISelectionPrivate.idl

@@ -28,7 +28,7 @@ native nsDirection(nsDirection);
 native ScrollAxis(nsIPresShell::ScrollAxis);
 
 [scriptable, builtinclass, uuid(0c9f4f74-ee7e-4fe9-be6b-0ba856368178)]
-interface nsISelectionPrivate : nsISelection
+interface nsISelectionPrivate : nsISupports
  {
     const short ENDOFPRECEDINGLINE=0;
     const short STARTOFNEXTLINE=1;