Bug 766344 - Fix some casts in nsChildView.mm r=josh

widget/cocoa/nsChildView.mm

@@ -304,20 +304,20 @@ nsresult nsChildView::Create(nsIWidget *aParent,
     // inherit the top-level window. NS_NATIVE_WIDGET is always a NSView
     // regardless of if we're asking a window or a view (for compatibility
     // with windows).
-    mParentView = (NSView*)aParent->GetNativeData(NS_NATIVE_WIDGET); 
+    mParentView = (NSView<mozView>*)aParent->GetNativeData(NS_NATIVE_WIDGET); 
     mParentWidget = aParent;   
   } else {
     // This is the normal case. When we're the root widget of the view hiararchy,
     // aNativeParent will be the contentView of our window, since that's what
     // nsCocoaWindow returns when asked for an NS_NATIVE_VIEW.
-    mParentView = reinterpret_cast<NSView*>(aNativeParent);
+    mParentView = reinterpret_cast<NSView<mozView>*>(aNativeParent);
   }
   
   // create our parallel NSView and hook it up to our parent. Recall
   // that NS_NATIVE_WIDGET is the NSView.
   NSRect r;
   nsCocoaUtils::GeckoRectToNSRect(mBounds, r);
-  mView = [CreateCocoaView(r) retain];
+  mView = [(NSView<mozView>*)CreateCocoaView(r) retain];
   if (!mView) return NS_ERROR_FAILURE;
 
   [(ChildView*)mView setIsPluginView:(mWindowType == eWindowType_plugin)];
@@ -709,7 +709,7 @@ nsChildView::ReparentNativeWidget(nsIWidget* aNewParent)
     return NS_OK;
 
   NSView<mozView>* newParentView =
-   (NSView*)aNewParent->GetNativeData(NS_NATIVE_WIDGET); 
+   (NSView<mozView>*)aNewParent->GetNativeData(NS_NATIVE_WIDGET); 
   NS_ENSURE_TRUE(newParentView, NS_ERROR_FAILURE);
 
   // we hold a ref to mView, so this is safe