[Sync] Replace typedef with using.

chrome/browser/sync/test/integration/await_match_status_change_checker.h

Index: chrome/browser/sync/test/integration/await_match_status_change_checker.h
diff --git a/chrome/browser/sync/test/integration/await_match_status_change_checker.h b/chrome/browser/sync/test/integration/await_match_status_change_checker.h
index d7ef74469265221dd4d5c6acbc32f62c010da9ee..d5a1309494d27fa34e52efa83160ff650a7ca6e9 100644
--- a/chrome/browser/sync/test/integration/await_match_status_change_checker.h
+++ b/chrome/browser/sync/test/integration/await_match_status_change_checker.h
@@ -16,7 +16,7 @@
 // verifies the state of all the profiles involved in the test.
 class AwaitMatchStatusChangeChecker : public MultiClientStatusChangeChecker {
  public:
-  typedef base::Callback<bool(void)> ExitConditionCallback;
+  using ExitConditionCallback = base::Callback<bool(void)>;
 
   AwaitMatchStatusChangeChecker(const ExitConditionCallback& condition,
                                 const std::string& debug_message);