Bug 396185 - Make nsIFrame derivatives and helper abstract classes use a different dynamic-cast system than nsISupports:

* we know all types frames may be cast to at compile time, so instead of extensible GUID IIDs, use a big enum (see nsQueryFrame::FrameIID)
* eliminate all vestiges of refcounting, since frames aren't refcounted

Some frames (SVG frames in particular) still implement nsISupports-derived interfaces, for example nsISVGValue. There is a FrameIID for nsISVGValue that lets you go from a frame to the XPCOM interface, but you can't query back.

r+sr=roc

nsITextControlFrame didn't have an IID the first time around, but this wasn't a compile error because nsITextControlFrame::kFrameIID inherited from nsIFormControlFrame::kFrameIID. I've added a static analysis pass to verify the correct behavior, since I can't figure out a way to make the compiler do it.

content/base/src/nsFrameLoader.cpp

@@ -635,8 +635,7 @@ nsFrameLoader::SwapWithOtherLoader(nsFrameLoader* aOther,
     return NS_ERROR_NOT_IMPLEMENTED;
   }
 
-  nsIFrameFrame* ourFrameFrame = nsnull;
-  CallQueryInterface(ourFrame, &ourFrameFrame);
+  nsIFrameFrame* ourFrameFrame = do_QueryFrame(ourFrame);
   if (!ourFrameFrame) {
     mInSwap = aOther->mInSwap = PR_FALSE;
     FirePageShowEvent(ourTreeItem, ourChromeEventHandler, PR_TRUE);