Remove some unused interfaces and files from widget. Bug 210169, r/sr=dbaron.

widget/public/Makefile.in

@@ -34,7 +34,6 @@ EXPORTS		= \
 		nsIMenuBar.h \
 		nsIMenu.h \
 		nsIMenuItem.h \
-		nsIPopUpMenu.h \
 		nsStringUtil.h \
 		nsIWidget.h \
 		nsIKBStateControl.h \
@@ -70,7 +69,6 @@ XPIDLSRCS	= \
 		nsIClipboardDragDropHookList.idl \
 		nsIDragSession.idl \
 		nsIDragService.idl \
-		nsIDragTracker.idl \
 		nsIFormatConverter.idl \
 		nsIClipboard.idl \
 		nsIClipboardHelper.idl \

widget/public/nsIDragSession.idl

@@ -23,7 +23,6 @@
 #include "nsISupports.idl"
 #include "nsISupportsArray.idl"
 #include "nsITransferable.idl"
-#include "nsIDragTracker.idl"
 
 
 %{ C++

widget/public/nsIMenuItem.h

@@ -52,7 +52,6 @@
   { 0xbb, 0x6f, 0x90, 0xf2, 0x40, 0xfe, 0x49, 0x3c } };
 
 class nsIMenu;
-class nsIPopUpMenu;
 class nsIWidget;
 class nsIMenuListener;
 class nsIChangeManager;

widget/src/xpwidgets/nsBaseDragService.h

@@ -78,7 +78,6 @@ protected:
   PRBool             mDoingDrag;
   nsSize             mTargetSize;
   PRUint32           mDragAction;  
-  nsCOMPtr<nsIDragTracker> mCurrentlyTracking;
   nsCOMPtr<nsIDOMNode> mSourceNode;
   nsCOMPtr<nsIDOMDocument> mSourceDocument;       // the document at the drag source. will be null
                                                   //  if it came from outside the app.