diff --git a/caps/src/nsScriptSecurityManager.cpp b/caps/src/nsScriptSecurityManager.cpp
index 0a58a6f2306d..0343af188eb6 100644
--- a/caps/src/nsScriptSecurityManager.cpp
+++ b/caps/src/nsScriptSecurityManager.cpp
@@ -3048,7 +3048,6 @@ nsresult nsScriptSecurityManager::Init()
 
     static const JSSecurityCallbacks securityCallbacks = {
         CheckObjectAccess,
-        nsJSPrincipals::Subsume,
         ObjectPrincipalFinder,
         ContentSecurityPolicyPermitsJSAction
     };
diff --git a/js/src/jsapi-tests/testOriginPrincipals.cpp b/js/src/jsapi-tests/testOriginPrincipals.cpp
index 2f963207741a..7b520682ffa0 100644
--- a/js/src/jsapi-tests/testOriginPrincipals.cpp
+++ b/js/src/jsapi-tests/testOriginPrincipals.cpp
@@ -15,7 +15,6 @@ ObjectPrincipalsFinder(JSObject *)
 }
 
 static const JSSecurityCallbacks seccb = {
-    NULL,
     NULL,
     ObjectPrincipalsFinder,
     NULL
diff --git a/js/src/jsapi.h b/js/src/jsapi.h
index c8ab0f09c61b..7172963dd7b9 100644
--- a/js/src/jsapi.h
+++ b/js/src/jsapi.h
@@ -1997,9 +1997,6 @@ typedef JSBool
 typedef void
 (* JSDestroyPrincipalsOp)(JSPrincipals *principals);
 
-typedef JSBool
-(* JSSubsumePrincipalsOp)(JSPrincipals *principals1, JSPrincipals *principals2);
-
 /*
  * Return a weak reference to the principals associated with obj, possibly via
  * the immutable parent chain leading from obj to a top-level container (e.g.,
@@ -4911,7 +4908,6 @@ JS_DropPrincipals(JSRuntime *rt, JSPrincipals *principals);
 
 struct JSSecurityCallbacks {
     JSCheckAccessOp            checkObjectAccess;
-    JSSubsumePrincipalsOp      subsumePrincipals;
     JSObjectPrincipalsFinder   findObjectPrincipals;
     JSCSPEvalChecker           contentSecurityPolicyAllows;
 };
diff --git a/js/src/jsobj.cpp b/js/src/jsobj.cpp
index d218bab15e4d..e787935de03a 100644
--- a/js/src/jsobj.cpp
+++ b/js/src/jsobj.cpp
@@ -661,25 +661,12 @@ obj_watch_handler(JSContext *cx, JSObject *obj_, jsid id_, jsval old,
     RootedObject obj(cx, obj_);
     RootedId id(cx, id_);
 
-    JSObject *callable = (JSObject *) closure;
-    if (JSSubsumePrincipalsOp subsume = cx->runtime->securityCallbacks->subsumePrincipals) {
-        if (JSPrincipals *watcher = callable->principals(cx)) {
-            if (JSObject *scopeChain = cx->stack.currentScriptedScopeChain()) {
-                if (JSPrincipals *subject = scopeChain->principals(cx)) {
-                    if (!subsume(watcher, subject)) {
-                        /* Silently don't call the watch handler. */
-                        return true;
-                    }
-                }
-            }
-        }
-    }
-
     /* Avoid recursion on (obj, id) already being watched on cx. */
     AutoResolving resolving(cx, obj, id, AutoResolving::WATCH);
     if (resolving.alreadyStarted())
         return true;
 
+    JSObject *callable = (JSObject *)closure;
     Value argv[] = { IdToValue(id), old, *nvp };
     return Invoke(cx, ObjectValue(*obj), ObjectOrNullValue(callable), ArrayLength(argv), argv, nvp);
 }
diff --git a/js/src/shell/js.cpp b/js/src/shell/js.cpp
index 146c6e9e40ad..c49e321e5124 100644
--- a/js/src/shell/js.cpp
+++ b/js/src/shell/js.cpp
@@ -4891,7 +4891,6 @@ CheckObjectAccess(JSContext *cx, HandleObject obj, HandleId id, JSAccessMode mod
 JSSecurityCallbacks securityCallbacks = {
     CheckObjectAccess,
     NULL,
-    NULL,
     NULL
 };