[es6] Introduce %ToInteger and %ToLength.

src/execution.h

Index: src/execution.h
diff --git a/src/execution.h b/src/execution.h
index 3822cbb49e7652c0d3e021b696bac97a85ff0c68..84f106a49689954d8f2d33625c7b14226be68976 100644
--- a/src/execution.h
+++ b/src/execution.h
@@ -52,23 +52,6 @@ class Execution final : public AllStatic {
                                      Handle<Object> argv[],
                                      MaybeHandle<Object>* exception_out = NULL);
 
-  // ECMA-262 9.4
-  MUST_USE_RESULT static MaybeHandle<Object> ToInteger(
-      Isolate* isolate, Handle<Object> obj);
-
-  // ECMA-262 9.5
-  MUST_USE_RESULT static MaybeHandle<Object> ToInt32(
-      Isolate* isolate, Handle<Object> obj);
-
-  // ECMA-262 9.6
-  MUST_USE_RESULT static MaybeHandle<Object> ToUint32(
-      Isolate* isolate, Handle<Object> obj);
-
-
-  // ES6, draft 10-14-14, section 7.1.15
-  MUST_USE_RESULT static MaybeHandle<Object> ToLength(
-      Isolate* isolate, Handle<Object> obj);
-
   // ECMA-262 9.8
   MUST_USE_RESULT static MaybeHandle<Object> ToDetailString(
       Isolate* isolate, Handle<Object> obj);