DevTools: Remove autogenerated blackbox patterns upon Unblackbox user action.

Source/devtools/front_end/sdk/BlackboxSupport.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 WebInspector.BlackboxSupport = function()
 {
 }
 
 /**
  * @param {string} url
+ * @return {string}
+ */
+WebInspector.BlackboxSupport._urlToRegExpString = function(url)
+{
+    var name = new WebInspector.ParsedURL(url).lastPathComponent;
+    return "/" + name.escapeForRegExp() + (url.endsWith(name) ? "$" : "\\b");
+}
+
+/**
+ * @param {string} url
  */
 WebInspector.BlackboxSupport.blackboxURL = function(url)
 {
     var regexPatterns = WebInspector.settings.skipStackFramesPattern.getAsArray();
-    var name = new WebInspector.ParsedURL(url).lastPathComponent;
-    var regexValue = "/" + name.escapeForRegExp() + (url.endsWith(name) ? "$" : "\\b");
+    var regexValue = WebInspector.BlackboxSupport._urlToRegExpString(url);
     var found = false;
     for (var i = 0; i < regexPatterns.length; ++i) {
         var item = regexPatterns[i];
         if (item.pattern === regexValue) {
             item.disabled = false;
             found = true;
             break;
         }
     }
     if (!found)
         regexPatterns.push({ pattern: regexValue });
     WebInspector.settings.skipStackFramesPattern.setAsArray(regexPatterns);
 }
 
 /**
  * @param {string} url
  */
 WebInspector.BlackboxSupport.unblackboxURL = function(url)
 {
     var regexPatterns = WebInspector.settings.skipStackFramesPattern.getAsArray();
+    var regexValue = WebInspector.BlackboxSupport._urlToRegExpString(url);
+    regexPatterns = regexPatterns.filter(function(item) {
+        return item.pattern !== regexValue;
+    });
     for (var i = 0; i < regexPatterns.length; ++i) {
         var item = regexPatterns[i];
         if (item.disabled)
             continue;
         try {
             var regex = new RegExp(item.pattern);
             if (regex.test(url))
                 item.disabled = true;
         } catch (e) {
         }
     }
     WebInspector.settings.skipStackFramesPattern.setAsArray(regexPatterns);
 }
 
 /**
  * @param {string} url
  * @return {boolean}
  */
 WebInspector.BlackboxSupport.isBlackboxedURL = function(url)
 {
     var regex = WebInspector.settings.skipStackFramesPattern.asRegExp();
     return (url && regex) ? regex.test(url) : false;
 }