DevTools: Allow dynamic module registration only in tests

Source/devtools/front_end/Runtime.js

Index: Source/devtools/front_end/Runtime.js
diff --git a/Source/devtools/front_end/Runtime.js b/Source/devtools/front_end/Runtime.js
index 364bbd560b9ee49e243a06b0429720969de0c042..532aa3600f66eb1a57600f7f98c70e696b5a5d53 100644
--- a/Source/devtools/front_end/Runtime.js
+++ b/Source/devtools/front_end/Runtime.js
@@ -132,13 +132,13 @@ Runtime.prototype = {
     registerModules: function(configuration)
     {
         for (var i = 0; i < configuration.length; ++i)
-            this.registerModule(configuration[i]);
+            this._registerModule(configuration[i]);
     },
 
     /**
      * @param {string} moduleName
      */
-    registerModule: function(moduleName)
+    _registerModule: function(moduleName)
     {
         if (!this._descriptorsMap[moduleName]) {
             var content = loadResource(moduleName + "/module.json");