Revert last patch about "Modal form" opcode support.

Signed-off-by: ydong10
Reviewed-by: lgao4



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11768 6f19259b-4bc3-4df7-8a09-765794883524

BaseTools/Source/C/VfrCompile/VfrFormPkg.h

@@ -809,16 +809,6 @@ public:
   }
 };
 
-class CIfrModal : public CIfrObj, public CIfrOpHeader {
-private:
-  EFI_IFR_MODAL *mModal;
-
-public:
-  CIfrModal () : CIfrObj (EFI_IFR_MODAL_TAG_OP, (CHAR8 **)&mModal),
-                 CIfrOpHeader (EFI_IFR_MODAL_TAG_OP, &mModal->Header) {
-  }
-};
-
 class CIfrLocked : public CIfrObj, public CIfrOpHeader {
 private:
   EFI_IFR_LOCKED *mLocked;