Revert of Debugger: use FrameInspector in ScopeIterator to find context.

test/mjsunit/regress/regress-4309-2.js

-// Copyright 2015 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --expose-debug-as debug --allow-natives-syntax
-
-var Debug = debug.Debug;
-
-var exception = null;
-
-function listener(event, exec_state, event_data, data) {
-  if (event != Debug.DebugEvent.Break) return;
-  try {
-    var scope = exec_state.frame().scope(0);
-    assertEquals(5, scope.scopeObject().property("i").value().value());
-  } catch (e) {
-    exception = e;
-  }
-}
-
-function f() {
-  eval('var i = 5');
-  debugger;
-}
-
-f();
-f();
-
-%OptimizeFunctionOnNextCall(f);
-Debug.setListener(listener);
-
-f();
-
-assertNull(exception);