mus: Remove unnecessary const from property TypeConverter templates

components/mus/public/cpp/window_property.h

Index: components/mus/public/cpp/window_property.h
diff --git a/components/mus/public/cpp/window_property.h b/components/mus/public/cpp/window_property.h
index d89a7b7e13541310b10d4fb02b203384e2b3812d..fafe416d9ec1b58da052d56f2d37238cc7f25d8c 100644
--- a/components/mus/public/cpp/window_property.h
+++ b/components/mus/public/cpp/window_property.h
@@ -47,7 +47,7 @@ namespace mus {
 template <typename T>
 void Window::SetSharedProperty(const std::string& name, const T& data) {
   const std::vector<uint8_t> bytes =
-      mojo::TypeConverter<const std::vector<uint8_t>, T>::Convert(data);
+      mojo::TypeConverter<std::vector<uint8_t>, T>::Convert(data);
   SetSharedPropertyInternal(name, &bytes);
 }
 
@@ -55,8 +55,7 @@ template <typename T>
 T Window::GetSharedProperty(const std::string& name) const {
   DCHECK(HasSharedProperty(name));
   auto it = properties_.find(name);
-  return mojo::TypeConverter<T, const std::vector<uint8_t>>::Convert(
-      it->second);
+  return mojo::TypeConverter<T, std::vector<uint8_t>>::Convert(it->second);
 }
 
 namespace {