[inspector] migrate stepping related methods to debug-interface

src/inspector/debugger-script.js

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 235 matching lines @@
  * @return {!Array<!JavaScriptCallFrame>}
  */
 DebuggerScript.currentCallFrames = function(execState, limit)
 {
     var frames = [];
     for (var i = 0; i < execState.frameCount() && (!limit || i < limit); ++i)
         frames.push(DebuggerScript._frameMirrorToJSCallFrame(execState.frame(i)));
     return frames;
 }
 
-/**
- * @param {!ExecutionState} execState
- */
-DebuggerScript.stepIntoStatement = function(execState)
-{
-    execState.prepareStep(Debug.StepAction.StepIn);
-}
-
-/**
- * @param {!ExecutionState} execState
- */
-DebuggerScript.stepFrameStatement = function(execState)
-{
-    execState.prepareStep(Debug.StepAction.StepFrame);
-}
-
-/**
- * @param {!ExecutionState} execState
- */
-DebuggerScript.stepOverStatement = function(execState)
-{
-    execState.prepareStep(Debug.StepAction.StepNext);
-}
-
-/**
- * @param {!ExecutionState} execState
- */
-DebuggerScript.stepOutOfFunction = function(execState)
-{
-    execState.prepareStep(Debug.StepAction.StepOut);
-}
-
-DebuggerScript.clearStepping = function()
-{
-    Debug.clearStepping();
-}
-
 // Returns array in form:
 //      [ 0, <v8_result_report> ] in case of success
 //   or [ 1, <general_error_message>, <compiler_message>, <line_number>, <column_number> ] in case of compile error, numbers are 1-based.
 // or throws exception with message.
 /**
  * @param {number} scriptId
  * @param {string} newSource
  * @param {boolean} preview
  * @return {!Array<*>}
  */
@@ skipping 374 matching lines @@
         break;
     }
     return result;
 }
 
 // We never resolve Mirror by its handle so to avoid memory leaks caused by Mirrors in the cache we disable it.
 ToggleMirrorCache(false);
 
 return DebuggerScript;
 })();