Merge 93042 - Web Inspector: [V8] crash upon stepIn while not on pause.

Source/WebCore/inspector/front-end/ScriptsPanel.js

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2011 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 867 matching lines @@
             this._stepping = false;
             this._waitingToPause = true;
             DebuggerAgent.pause();
         }
 
         this._clearInterface();
     },
 
     _stepOverClicked: function()
     {
+        if (!this._paused)
+            return;
+
         this._paused = false;
         this._stepping = true;
 
         this._clearInterface();
 
         DebuggerAgent.stepOver();
     },
 
     _stepIntoClicked: function()
     {
+        if (!this._paused)
+            return;
+
         this._paused = false;
         this._stepping = true;
 
         this._clearInterface();
 
         DebuggerAgent.stepInto();
     },
 
     _stepOutClicked: function()
     {
+        if (!this._paused)
+            return;
+
         this._paused = false;
         this._stepping = true;
 
         this._clearInterface();
 
         DebuggerAgent.stepOut();
     },
 
     toggleBreakpointsClicked: function()
     {
@@ skipping 261 matching lines @@
     },
 
     suggestedFileName: function()
     {
         var sourceFile = this._model.sourceFile(this._sourceFileId);
         return WebInspector.panels.scripts._displayNameForScriptURL(sourceFile.url) || "untitled.js";
     }
 }
 
 WebInspector.SourceFrameDelegateForScriptsPanel.prototype.__proto__ = WebInspector.SourceFrameDelegate.prototype;