Introduce a single call to grab default browser on Win8 for tests.

ash/test/test_suite.h

 // 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.
 
 #ifndef ASH_TEST_TEST_SUITE_H_
 #define ASH_TEST_TEST_SUITE_H_
 
 #include "base/compiler_specific.h"
 #include "base/test/test_suite.h"
 
+#if defined(OS_WIN)
+#include "base/memory/scoped_ptr.h"
+#include "base/win/scoped_com_initializer.h"
+#endif
+
 namespace ash {
 namespace test {
 
 class AuraShellTestSuite : public base::TestSuite {
  public:
   AuraShellTestSuite(int argc, char** argv);
 
  protected:
   // base::TestSuite:
   virtual void Initialize() OVERRIDE;
   virtual void Shutdown() OVERRIDE;
+
+ private:
+#if defined(OS_WIN)
+  scoped_ptr<base::win::ScopedCOMInitializer> com_initializer_;
+#endif
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_TEST_SUITE_H_