Remove TaskType::kUnthrottled

Now LocalDOMWindow::event_queue_ is no longer used by IndexedDB, the
task type doesn't have to be 'kUnthrottled'. This was the last one usage
of kUnthrottled and we can remove this now.

Bug: 836410, 846618
Change-Id: Ifb5913d93a36cc6f8a5f645c6ecbf0016e424ad4
Reviewed-on: https://chromium-review.googlesource.com/1092225Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565611}

third_party/blink/public/platform/task_type.h

@@ -187,14 +187,6 @@ enum class TaskType : unsigned {
   kWorkerThreadTaskQueueV8 = 47,
   kWorkerThreadTaskQueueCompositor = 48,
 
-  ///////////////////////////////////////
-  // The following task types are DEPRECATED! Use kInternal* instead.
-  ///////////////////////////////////////
-
-  // Tasks that must not be throttled should be posted here, but the usage
-  // should be very limited.
-  kUnthrottled = 25,
-
   kCount = 49,
 };
 

third_party/blink/renderer/core/frame/local_dom_window.cc

@@ -317,13 +317,10 @@ Document* LocalDOMWindow::InstallNewDocument(const String& mime_type,
 
   document_ = CreateDocument(mime_type, init, force_xhtml);
 
-  // This queue is unthrottled because throttling IndexedDB events may break
-  // scenarios where several tabs, some of which are backgrounded, access
-  // the same database concurrently.
   // TODO(hajimehoshi): Task type should be determined by a posted event instead
   // of specifying here.
   event_queue_ =
-      EventQueueImpl::Create(document_.Get(), TaskType::kUnthrottled);
+      EventQueueImpl::Create(document_.Get(), TaskType::kInternalDefault);
   document_->Initialize();
 
   if (!GetFrame())

third_party/blink/renderer/core/workers/parent_execution_context_task_runners.cc

@@ -31,8 +31,7 @@ ParentExecutionContextTaskRunners::ParentExecutionContextTaskRunners(
   for (auto type : {TaskType::kNetworking, TaskType::kPostedMessage,
                     TaskType::kInternalDefault, TaskType::kInternalLoading,
                     TaskType::kInternalTest, TaskType::kInternalMedia,
-                    TaskType::kInternalInspector, TaskType::kInternalWorker,
-                    TaskType::kUnthrottled}) {
+                    TaskType::kInternalInspector, TaskType::kInternalWorker}) {
     auto task_runner =
         context ? context->GetTaskRunner(type)
                 : Platform::Current()->CurrentThread()->GetTaskRunner();

third_party/blink/renderer/platform/scheduler/main_thread/frame_scheduler_impl.cc

@@ -320,7 +320,6 @@ scoped_refptr<base::SingleThreadTaskRunner> FrameSchedulerImpl::GetTaskRunner(
     case TaskType::kInternalMediaRealTime:
     case TaskType::kInternalUserInteraction:
     case TaskType::kInternalIntersectionObserver:
-    case TaskType::kUnthrottled:
       return TaskQueueWithTaskType::Create(PausableTaskQueue(), type);
     case TaskType::kInternalIPC:
     // The TaskType of Inspector tasks needs to be unpausable because they need

third_party/blink/renderer/platform/scheduler/main_thread/main_thread_scheduler_impl.cc

@@ -168,8 +168,6 @@ const char* TaskTypeToString(TaskType task_type) {
       return "InternalDefault";
     case TaskType::kInternalLoading:
       return "InternalLoading";
-    case TaskType::kUnthrottled:
-      return "Unthrottled";
     case TaskType::kInternalTest:
       return "InternalTest";
     case TaskType::kInternalWebCrypto:

third_party/blink/renderer/platform/scheduler/worker/worker_scheduler.cc

@@ -114,7 +114,6 @@ scoped_refptr<base::SingleThreadTaskRunner> WorkerScheduler::GetTaskRunner(
     case TaskType::kMiscPlatformAPI:
     case TaskType::kInternalDefault:
     case TaskType::kInternalLoading:
-    case TaskType::kUnthrottled:
     case TaskType::kInternalTest:
     case TaskType::kInternalWebCrypto:
     case TaskType::kInternalIndexedDB: