[VS Addin] Add visual studio 2012 support

visual_studio/NativeClientVSAddIn/UnitTests/CompileTest.cs

 // Copyright (c) 2012 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.
 using System;
 using System.Text;
 using System.Collections.Generic;
-using EnvDTE;
 using EnvDTE80;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Microsoft.VisualStudio.VCProjectEngine;
 using NaCl.Build.CPPTasks;
 using NativeClientVSAddIn;
 
 namespace UnitTests
 {
     [TestClass]
     public class ComileTest : BaseCompileTest
     {
         private static string SolutionBaseName_ = "CompileTest";
 
         [ClassInitialize]
-        public new static void ClassSetUp(TestContext testContext)
+        public static void ClassSetUp(TestContext testContext)
         {
             BaseCompileTest.ClassSetUp(testContext, SolutionBaseName_);
         }
 
         /// <summary>
         /// This is run after each test to clean up things created in TestSetup().
         /// </summary>
         [TestCleanup]
         public void ClassTearDown()
         {
@@ skipping 41 matching lines @@
             string root = System.Environment.GetEnvironmentVariable("NACL_SDK_ROOT");
             if (!SDKUtilities.SupportsPNaCl(root))
             {
                 Assert.Inconclusive();
             }
             CheckCompile(Strings.PNaClPlatformName, false);
         }
 
     }
 }