Remove use strict directives in main VS Code src (part 3)

We compile using the alwaysStrict flag so these directives are not needed.

This part removes most of the remaining use strict directives that were not caught by part 1 and 2

src/vs/platform/instantiation/test/common/instantiationServiceMock.ts

@@ -3,7 +3,6 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-'use strict';
 
 import * as sinon from 'sinon';
 import { TPromise } from 'vs/base/common/winjs.base';