Revert of Debugger: preserve stepping state after evaluating breakpoint condition.

test/mjsunit/regress/regress-crbug-467180.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
-
-function f() {
-  for (var i = 10; i < 14; i++) {  // 1
-    i;                             // 2
-  }
-}                                  // 3
-
-var state = "conditional";
-var log = [];
-var exception = null;
-
-function listener(event, exec_state, event_data, data) {
-  if (event != Debug.DebugEvent.Break) return;
-  try {
-    var label = +exec_state.frame(0).sourceLineText().substr(-1);
-    log.push(label);
-    if (label == 2) log.push(exec_state.frame(0).evaluate("i").value());
-    exec_state.prepareStep(Debug.StepAction.StepNext, 1);
-  } catch (e) {
-    exception = e;
-    print("Caught something. " + e + " " + e.stack);
-  };
-};
-
-
-var Debug = debug.Debug;
-Debug.setListener(listener);
-
-Debug.setBreakPoint(f, 2, 0, "i == 12");
-
-f();
-
-Debug.setListener(null);  // 4
-
-assertEquals([2,12,1,1,2,13,1,1,3,4], log);
-assertNull(exception);