Mojo C++ bindings: switch the existing usage of StructTraits to use the new data view interface.

mojo/public/cpp/bindings/lib/serialization_util.h

Index: mojo/public/cpp/bindings/lib/serialization_util.h
diff --git a/mojo/public/cpp/bindings/lib/serialization_util.h b/mojo/public/cpp/bindings/lib/serialization_util.h
index 8e926cc5e832803781cf6b8e9a026e4be8ced18f..1b362d17d83f369ce911bd3a19806a289caaf07c 100644
--- a/mojo/public/cpp/bindings/lib/serialization_util.h
+++ b/mojo/public/cpp/bindings/lib/serialization_util.h
@@ -102,20 +102,6 @@ inline void InterfaceDataToPointer(Interface_Data* input,
       input->version));
 }
 
-// TODO(yzshen): Unify StructTraits::Read*() methods and remove
-// HasReadFromDataViewMethod.
-template <typename T>
-struct HasReadFromDataViewMethod {
-  template <typename U>
-  static char Test(decltype(U::ReadFromDataView)*);
-  template <typename U>
-  static int Test(...);
-  static const bool value = sizeof(Test<T>(0)) == sizeof(char);
-
- private:
-  EnsureTypeIsComplete<T> check_t_;
-};
-
 template <typename T>
 struct HasIsNullMethod {
   template <typename U>