Bug 1773088 - Part 3: Remove StealFromAndBuildClonedMessageData, r=asuth

This API should no longer be necessary, as there's nothing tied to a specific
actor in the serialized IPCBlob form any longer, so the value can be directly
transferred without special handling or re-serialization.

Differential Revision: https://phabricator.services.mozilla.com/D148533

dom/serviceworkers/ServiceWorkerCloneData.cpp

@@ -32,30 +32,6 @@ ServiceWorkerCloneData::ServiceWorkerCloneData()
   MOZ_DIAGNOSTIC_ASSERT(mEventTarget);
 }
 
-bool ServiceWorkerCloneData::StealFromAndBuildClonedMessageData(
-    ClonedOrErrorMessageData& aFromClonedData,
-    ClonedOrErrorMessageData& aToClonedData) {
-  if (aFromClonedData.type() == ClonedOrErrorMessageData::TErrorMessageData) {
-    mIsErrorMessageData = true;
-    aToClonedData = ErrorMessageData();
-    return true;
-  }
-
-  MOZ_DIAGNOSTIC_ASSERT(aFromClonedData.type() ==
-                        ClonedOrErrorMessageData::TClonedMessageData);
-
-  StructuredCloneData::StealFromClonedMessageData(aFromClonedData);
-
-  ClonedMessageData messageData;
-  if (!StructuredCloneData::BuildClonedMessageData(messageData)) {
-    return false;
-  }
-
-  aToClonedData = std::move(messageData);
-
-  return true;
-}
-
 bool ServiceWorkerCloneData::BuildClonedMessageData(
     ClonedOrErrorMessageData& aClonedData) {
   if (IsErrorMessageData()) {

dom/serviceworkers/ServiceWorkerCloneData.h

@@ -54,13 +54,6 @@ class ServiceWorkerCloneData final : public ipc::StructuredCloneData {
  public:
   ServiceWorkerCloneData();
 
-  // FIXME: Now that there's nothing in ClonedOrErrorMessageData tied to a
-  // specific actor, it should be possible to just pass on the same cloned data,
-  // which means this method is effectively an expensive no-op.
-  bool StealFromAndBuildClonedMessageData(
-      ClonedOrErrorMessageData& aFromClonedData,
-      ClonedOrErrorMessageData& aToClonedData);
-
   bool BuildClonedMessageData(ClonedOrErrorMessageData& aClonedData);
 
   void CopyFromClonedMessageData(const ClonedOrErrorMessageData& aClonedData);

dom/workers/remoteworkers/RemoteWorkerController.cpp

@@ -464,10 +464,9 @@ bool RemoteWorkerController::PendingServiceWorkerOp::MaybeStart(
     return false;
   }
 
-  const auto send = [this, &aOwner](const ServiceWorkerOpArgs& args) {
-    MaybeReportServiceWorkerShutdownProgress(args);
+  MaybeReportServiceWorkerShutdownProgress(mArgs);
 
-    aOwner->mActor->SendExecServiceWorkerOp(args)->Then(
+  aOwner->mActor->SendExecServiceWorkerOp(mArgs)->Then(
       GetCurrentSerialEventTarget(), __func__,
       [promise = std::move(mPromise)](
           PRemoteWorkerParent::ExecServiceWorkerOpPromise::
@@ -479,27 +478,6 @@ bool RemoteWorkerController::PendingServiceWorkerOp::MaybeStart(
 
         promise->Resolve(std::move(aResult.ResolveValue()), __func__);
       });
-  };
-
-  if (mArgs.type() == ServiceWorkerOpArgs::TServiceWorkerMessageEventOpArgs) {
-    auto& args = mArgs.get_ServiceWorkerMessageEventOpArgs();
-
-    ServiceWorkerMessageEventOpArgs copyArgs;
-    copyArgs.clientInfoAndState() = std::move(args.clientInfoAndState());
-
-    RefPtr<ServiceWorkerCloneData> copyData = new ServiceWorkerCloneData();
-    if (!copyData->StealFromAndBuildClonedMessageData(args.clonedData(),
-                                                      copyArgs.clonedData())) {
-      mPromise->Reject(NS_ERROR_DOM_DATA_CLONE_ERR, __func__);
-      mPromise = nullptr;
-      return true;
-    }
-
-    // copyArgs depends on mArgs due to BuildClonedMessageData.
-    send(std::move(copyArgs));
-  } else {
-    send(mArgs);
-  }
 
   return true;
 }