Move registration of ReadRuntimeVersionExt to ExecutionExtension (#13820)

Instead of registering `ReadRuntimeVersionExt` in `sp-state-machine` it is moved to
`ExecutionExtension` which provides the default extensions.

substrate/primitives/core/src/traits.rs

@@ -157,6 +157,16 @@ pub trait ReadRuntimeVersion: Send + Sync {
 	) -> Result<Vec<u8>, String>;
 }
 
+impl ReadRuntimeVersion for std::sync::Arc<dyn ReadRuntimeVersion> {
+	fn read_runtime_version(
+		&self,
+		wasm_code: &[u8],
+		ext: &mut dyn Externalities,
+	) -> Result<Vec<u8>, String> {
+		(**self).read_runtime_version(wasm_code, ext)
+	}
+}
+
 sp_externalities::decl_extension! {
 	/// An extension that provides functionality to read version information from a given wasm blob.
 	pub struct ReadRuntimeVersionExt(Box<dyn ReadRuntimeVersion>);

substrate/primitives/state-machine/src/lib.rs

@@ -163,7 +163,7 @@ mod execution {
 	use sp_core::{
 		hexdisplay::HexDisplay,
 		storage::{ChildInfo, ChildType, PrefixedStorageKey},
-		traits::{CallContext, CodeExecutor, ReadRuntimeVersionExt, RuntimeCode},
+		traits::{CallContext, CodeExecutor, RuntimeCode},
 	};
 	use sp_externalities::Extensions;
 	use std::{
@@ -322,12 +322,10 @@ mod execution {
 			exec: &'a Exec,
 			method: &'a str,
 			call_data: &'a [u8],
-			mut extensions: Extensions,
+			extensions: Extensions,
 			runtime_code: &'a RuntimeCode,
 			context: CallContext,
 		) -> Self {
-			extensions.register(ReadRuntimeVersionExt::new(exec.clone()));
-
 			Self {
 				backend,
 				exec,