Bug 1810942 - Mark ReadRequest::ChunkSteps as MOZ_CAN_RUN_SCRIPT r=evilpie

Simple enough as callers already are marked as MOZ_CAN_RUN_SCRIPT.

Differential Revision: https://phabricator.services.mozilla.com/D170879

dom/streams/ReadRequest.h

@@ -24,8 +24,10 @@ struct ReadRequest : public nsISupports,
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
   NS_DECL_CYCLE_COLLECTION_CLASS(ReadRequest)
 
-  virtual void ChunkSteps(JSContext* aCx, JS::Handle<JS::Value> aChunk,
-                          ErrorResult& aRv) = 0;
+  // PipeToReadRequest::ChunkSteps can run script, for example.
+  MOZ_CAN_RUN_SCRIPT virtual void ChunkSteps(JSContext* aCx,
+                                             JS::Handle<JS::Value> aChunk,
+                                             ErrorResult& aRv) = 0;
   MOZ_CAN_RUN_SCRIPT virtual void CloseSteps(JSContext* aCx,
                                              ErrorResult& aRv) = 0;
   virtual void ErrorSteps(JSContext* aCx, JS::Handle<JS::Value> e,

dom/streams/ReadableStreamPipeTo.cpp

@@ -630,9 +630,9 @@ struct PipeToReadRequest : public ReadRequest {
   explicit PipeToReadRequest(PipeToPump* aPipeToPump)
       : mPipeToPump(aPipeToPump) {}
 
-  MOZ_CAN_RUN_SCRIPT_BOUNDARY void ChunkSteps(JSContext* aCx,
-                                              JS::Handle<JS::Value> aChunk,
-                                              ErrorResult& aRv) override {
+  MOZ_CAN_RUN_SCRIPT void ChunkSteps(JSContext* aCx,
+                                     JS::Handle<JS::Value> aChunk,
+                                     ErrorResult& aRv) override {
     RefPtr<PipeToPump> pipeToPump = mPipeToPump;  // XXX known live?
     pipeToPump->OnReadFulfilled(aCx, aChunk, aRv);
   }