[Objects] refactor out RootObjectProvider

Refactor RootObjectProvider to separate file for simplicty.

https://github.com/nasa/openmct/issues/1251

src/api/objects/ObjectAPI.js

@@ -24,12 +24,14 @@ define([
     'lodash',
     './object-utils',
     './MutableObject',
-    './RootRegistry'
+    './RootRegistry',
+    './RootObjectProvider'
 ], function (
     _,
     utils,
     MutableObject,
-    RootRegistry
+    RootRegistry,
+    RootObjectProvider
 ) {
 
 
@@ -43,18 +45,7 @@ define([
     function ObjectAPI() {
         this.providers = {};
         this.rootRegistry = new RootRegistry();
-        this.rootProvider = {
+        this.rootProvider = new RootObjectProvider(this.rootRegistry);
-            'get': function () {
-                return this.rootRegistry.getRoots()
-                    .then(function (roots) {
-                        return {
-                            name: 'The root object',
-                            type: 'root',
-                            composition: roots
-                        };
-                    });
-            }.bind(this)
-        };
     }
 
     ObjectAPI.prototype.supersecretSetFallbackProvider = function (p) {

src/api/objects/RootObjectProvider.js

@@ -0,0 +1,43 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2016, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+
+define([
+], function (
+) {
+
+    function RootObjectProvider(rootRegistry) {
+        this.rootRegistry = rootRegistry;
+    }
+
+    RootObjectProvider.prototype.get = function () {
+        return this.rootRegistry.getRoots()
+            .then(function (roots) {
+                return {
+                    name: 'The root object',
+                    type: 'root',
+                    composition: roots
+                };
+            });
+    }
+
+    return RootObjectProvider;
+});