[debugger] remove step count parameter from prepare step.

src/debug/debug.js

 // Copyright 2012 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.
 
 (function (global, utils) {
 "use strict";
 
 // ----------------------------------------------------------------------------
 // Imports
 
@@ skipping 925 matching lines @@
 
 function MakeExecutionState(break_id) {
   return new ExecutionState(break_id);
 }
 
 function ExecutionState(break_id) {
   this.break_id = break_id;
   this.selected_frame = 0;
 }
 
-ExecutionState.prototype.prepareStep = function(opt_action, opt_count) {
-  var action = Debug.StepAction.StepIn;
-  if (!IS_UNDEFINED(opt_action)) action = TO_NUMBER(opt_action);
-  var count = opt_count ? TO_NUMBER(opt_count) : 1;
-  return %PrepareStep(this.break_id, action, count);
+ExecutionState.prototype.prepareStep = function(action) {
+  if (action === Debug.StepAction.StepIn ||
+      action === Debug.StepAction.StepOut ||
+      action === Debug.StepAction.StepNext ||
+      action === Debug.StepAction.StepFrame) {
+    return %PrepareStep(this.break_id, action);
+  }
+  throw MakeTypeError(kDebuggerType);
 };
 
 ExecutionState.prototype.evaluateGlobal = function(source, disable_break,
     opt_additional_context) {
   return MakeMirror(%DebugEvaluateGlobal(this.break_id, source,
                                          TO_BOOLEAN(disable_break),
                                          opt_additional_context));
 };
 
 ExecutionState.prototype.frameCount = function() {
@@ skipping 483 matching lines @@
   } catch (e) {
     // Failed in one of the catch blocks above - most generic error.
     return '{"seq":0,"type":"response","success":false,"message":"Internal error"}';
   }
 };
 
 
 DebugCommandProcessor.prototype.continueRequest_ = function(request, response) {
   // Check for arguments for continue.
   if (request.arguments) {
-    var count = 1;
     var action = Debug.StepAction.StepIn;
 
     // Pull out arguments.
     var stepaction = request.arguments.stepaction;
-    var stepcount = request.arguments.stepcount;
-
-    // Get the stepcount argument if any.
-    if (stepcount) {
-      count = TO_NUMBER(stepcount);
-      if (count < 0) {
-        throw MakeError(kDebugger,
-                        'Invalid stepcount argument "' + stepcount + '".');
-      }
-    }
 
     // Get the stepaction argument.
     if (stepaction) {
       if (stepaction == 'in') {
         action = Debug.StepAction.StepIn;
       } else if (stepaction == 'next') {
         action = Debug.StepAction.StepNext;
       } else if (stepaction == 'out') {
         action = Debug.StepAction.StepOut;
       } else {
         throw MakeError(kDebugger,
                         'Invalid stepaction argument "' + stepaction + '".');
       }
     }
 
     // Set up the VM for stepping.
-    this.exec_state_.prepareStep(action, count);
+    this.exec_state_.prepareStep(action);
   }
 
   // VM should be running after executing this request.
   response.running = true;
 };
 
 
 DebugCommandProcessor.prototype.breakRequest_ = function(request, response) {
   // Ignore as break command does not do anything when broken.
 };
@@ skipping 1115 matching lines @@
   "IsBreakPointTriggered", IsBreakPointTriggered,
   "UpdateScriptBreakPoints", UpdateScriptBreakPoints,
 ]);
 
 // Export to liveedit.js
 utils.Export(function(to) {
   to.GetScriptBreakPoints = GetScriptBreakPoints;
 });
 
 })