C++11: Use type aliases instead of typedefs

snapshot/mac/process_reader_test.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 271 matching lines @@
     return nullptr;
   }
 
   // This is a PointerVector because the address of a ThreadInfo object is
   // passed to each thread’s ThreadMain(), so they cannot move around in memory.
   PointerVector<ThreadInfo> thread_infos_;
 
   DISALLOW_COPY_AND_ASSIGN(TestThreadPool);
 };
 
-typedef std::map<uint64_t, TestThreadPool::ThreadExpectation> ThreadMap;
+using ThreadMap = std::map<uint64_t, TestThreadPool::ThreadExpectation>;
 
 // Verifies that all of the threads in |threads|, obtained from ProcessReader,
 // agree with the expectation in |thread_map|. If |tolerate_extra_threads| is
 // true, |threads| is allowed to contain threads that are not listed in
 // |thread_map|. This is useful when testing situations where code outside of
 // the test’s control (such as system libraries) may start threads, or may have
 // started threads prior to a test’s execution.
 void ExpectSeveralThreads(ThreadMap* thread_map,
                           const std::vector<ProcessReader::Thread>& threads,
                           const bool tolerate_extra_threads) {
@@ skipping 380 matching lines @@
 };
 
 TEST(ProcessReader, ChildModules) {
   ProcessReaderModulesChild process_reader_modules_child;
   process_reader_modules_child.Run();
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace crashpad