Normalize end of file newlines in base/. All files end in a single newline.

base/singleton_unittest.cc

 // Copyright (c) 2006-2008 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.
 
 #include "base/at_exit.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/singleton.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 189 matching lines @@
       EXPECT_EQ(*singleton_int_1, 0);
     }
     {
       singleton_int_5 = SingletonInt5();
       EXPECT_EQ(*singleton_int_5, 5);
     }
   }
   // The leaky singleton shouldn't leak since SingletonLeak has not been called.
   VerifiesCallbacksNotCalled();
 }
-