Replace typedef with using for Callback/Bind related files

base/callback_internal.h

Index: base/callback_internal.h
diff --git a/base/callback_internal.h b/base/callback_internal.h
index a2adbf914bb64e589dfe3ee4afcd4783dea75b16..d1d8ab8ec659265f2b7f19cce493baf630aa9ad3 100644
--- a/base/callback_internal.h
+++ b/base/callback_internal.h
@@ -73,7 +73,7 @@ class BASE_EXPORT CallbackBase {
   // another type. It is not okay to use void*. We create a InvokeFuncStorage
   // that that can store our function pointer, and then cast it back to
   // the original type on usage.
-  typedef void(*InvokeFuncStorage)(void);
+  using InvokeFuncStorage = void(*)();
 
   // Returns true if this callback equals |other|. |other| may be null.
   bool Equals(const CallbackBase& other) const;
@@ -148,8 +148,8 @@ struct CallbackParamTraits
 
 template <typename T>
 struct CallbackParamTraitsForNonMoveOnlyType {
-  typedef const T& ForwardType;
-  typedef T StorageType;
+  using ForwardType = const T&;
+  using StorageType = T;
 };
 
 // The Storage should almost be impossible to trigger unless someone manually
@@ -159,8 +159,8 @@ struct CallbackParamTraitsForNonMoveOnlyType {
 // The ForwardType should only be used for unbound arguments.
 template <typename T>
 struct CallbackParamTraitsForNonMoveOnlyType<T&> {
-  typedef T& ForwardType;
-  typedef T StorageType;
+  using ForwardType = T&;
+  using StorageType = T;
 };
 
 // Note that for array types, we implicitly add a const in the conversion. This
@@ -170,15 +170,15 @@ struct CallbackParamTraitsForNonMoveOnlyType<T&> {
 // restriction.
 template <typename T, size_t n>
 struct CallbackParamTraitsForNonMoveOnlyType<T[n]> {
-  typedef const T* ForwardType;
-  typedef const T* StorageType;
+  using ForwardType = const T*;
+  using StorageType = const T*;
 };
 
 // See comment for CallbackParamTraits<T[n]>.
 template <typename T>
 struct CallbackParamTraitsForNonMoveOnlyType<T[]> {
-  typedef const T* ForwardType;
-  typedef const T* StorageType;
+  using ForwardType = const T*;
+  using StorageType = const T*;
 };
 
 // Parameter traits for movable-but-not-copyable scopers.
@@ -196,8 +196,8 @@ struct CallbackParamTraitsForNonMoveOnlyType<T[]> {
 // function or a cast would not be usable with Callback<> or Bind().
 template <typename T>
 struct CallbackParamTraitsForMoveOnlyType {
-  typedef T ForwardType;
-  typedef T StorageType;
+  using ForwardType = T;
+  using StorageType = T;
 };
 
 // CallbackForward() is a very limited simulation of C++11's std::forward()