C++11: Use type aliases instead of typedefs

util/mach/symbolic_constants_mach_test.cc

Index: util/mach/symbolic_constants_mach_test.cc
diff --git a/util/mach/symbolic_constants_mach_test.cc b/util/mach/symbolic_constants_mach_test.cc
index ff7d71dbcb97f8a43c36583e5008513a5ef525b4..3ac09f24f76c5a953af8ec23b08798834857b0bf 100644
--- a/util/mach/symbolic_constants_mach_test.cc
+++ b/util/mach/symbolic_constants_mach_test.cc
@@ -134,7 +134,7 @@ const struct {
 };
 
 struct ConvertExceptionTraits {
-  typedef exception_type_t ValueType;
+  using ValueType = exception_type_t;
   static std::string SomethingToString(
       ValueType value,
       SymbolicConstantToStringOptions options) {
@@ -309,7 +309,7 @@ const struct {
 };
 
 struct ConvertExceptionMaskTraits {
-  typedef exception_mask_t ValueType;
+  using ValueType = exception_mask_t;
   static std::string SomethingToString(
       ValueType value,
       SymbolicConstantToStringOptions options) {
@@ -552,7 +552,7 @@ const struct {
 };
 
 struct ConvertExceptionBehaviorTraits {
-  typedef exception_behavior_t ValueType;
+  using ValueType = exception_behavior_t;
   static std::string SomethingToString(
       ValueType value,
       SymbolicConstantToStringOptions options) {
@@ -815,7 +815,7 @@ const struct {
 };
 
 struct ConvertThreadStateFlavorTraits {
-  typedef thread_state_flavor_t ValueType;
+  using ValueType = thread_state_flavor_t;
   static std::string SomethingToString(
       ValueType value,
       SymbolicConstantToStringOptions options) {