EDK: Sprinkle some more |final| secret sauce.

mojo/edk/test/multiprocess_test_helper.h

 // Copyright 2013 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 MOJO_EDK_TEST_MULTIPROCESS_TEST_HELPER_H_
 #define MOJO_EDK_TEST_MULTIPROCESS_TEST_HELPER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/process/process.h"
 #include "base/test/multiprocess_test.h"
 #include "mojo/edk/embedder/scoped_platform_handle.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "testing/multiprocess_func_list.h"
 
 namespace mojo {
 
 namespace embedder {
 class PlatformChannelPair;
 }
 
 namespace test {
 
-class MultiprocessTestHelper {
+class MultiprocessTestHelper final {
  public:
   MultiprocessTestHelper();
   ~MultiprocessTestHelper();
 
   // Start a child process and run the "main" function "named" |test_child_name|
   // declared using |MOJO_MULTIPROCESS_TEST_CHILD_MAIN()| or
   // |MOJO_MULTIPROCESS_TEST_CHILD_TEST()| (below).
   void StartChild(const std::string& test_child_name);
   // Like |StartChild()|, but appends an extra switch (with ASCII value) to the
   // command line. (The switch must not already be present in the default
@@ skipping 53 matching lines @@
             ::testing::Test::HasNonfatalFailure())         \
                ? 1                                         \
                : 0;                                        \
   }                                                        \
   void test_child_name##TestChildTest()
 
 }  // namespace test
 }  // namespace mojo
 
 #endif  // MOJO_EDK_TEST_MULTIPROCESS_TEST_HELPER_H_