ignore applets, plugins, and embed tags in mac click-hold context menu code. r=pchen/sr=hyatt/a=asa. bug 77774.

content/events/src/nsEventStateManager.cpp

@@ -932,6 +932,8 @@ nsEventStateManager :: FireContextClick ( )
         allowedToDispatch = PR_FALSE;
       else if ( tag == nsXULAtoms::scrollbar || tag == nsXULAtoms::scrollbarbutton || tag == nsXULAtoms::button )
         allowedToDispatch = PR_FALSE;
+      else if ( tag == nsHTMLAtoms::applet || tag == nsHTMLAtoms::object || tag == nsHTMLAtoms::embed )
+        allowedToDispatch = PR_FALSE;
     
       if ( allowedToDispatch ) {
         // stop selection tracking, we're in control now