cros: Remove the unneed default ctor from ScreenLockLibrary interface.

chrome/browser/chromeos/cros/mock_screen_lock_library.h

Index: chrome/browser/chromeos/cros/mock_screen_lock_library.h
diff --git a/chrome/browser/chromeos/cros/mock_screen_lock_library.h b/chrome/browser/chromeos/cros/mock_screen_lock_library.h
index 623e7fc76ee62e74491477c801342d27d156e14e..4034aefac96320decf5926294a4bc8d4e707527e 100644
--- a/chrome/browser/chromeos/cros/mock_screen_lock_library.h
+++ b/chrome/browser/chromeos/cros/mock_screen_lock_library.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
@@ -16,6 +16,8 @@ class MockScreenLockLibrary : public ScreenLockLibrary {
   MockScreenLockLibrary();
   virtual ~MockScreenLockLibrary();
 
+  MOCK_METHOD0(Init, void());
+
   MOCK_METHOD1(AddObserver, void(Observer*));
   MOCK_METHOD1(RemoveObserver, void(Observer*));