Run microtasks at the end of each worker task.

Source/bindings/core/v8/ScriptPromiseResolver.cpp

Index: Source/bindings/core/v8/ScriptPromiseResolver.cpp
diff --git a/Source/bindings/core/v8/ScriptPromiseResolver.cpp b/Source/bindings/core/v8/ScriptPromiseResolver.cpp
index 069cd60599173c880a085a94866449ea290b7169..2e2f7be95ccc5028fb55aa2c270db0724cbefee8 100644
--- a/Source/bindings/core/v8/ScriptPromiseResolver.cpp
+++ b/Source/bindings/core/v8/ScriptPromiseResolver.cpp
@@ -64,10 +64,6 @@ void ScriptPromiseResolver::resolveOrRejectImmediately()
     ASSERT(!executionContext()->activeDOMObjectsAreStopped());
     ASSERT(!executionContext()->activeDOMObjectsAreSuspended());
     {
-        // FIXME: The V8RecursionScope is only necessary to force microtask delivery for promises
-        // resolved or rejected in workers. It can be removed once worker threads run microtasks
-        // at the end of every task (rather than just the main thread).
-        V8RecursionScope scope(m_scriptState->isolate(), m_scriptState->executionContext());
         if (m_state == Resolving) {
             m_resolver.resolve(m_value.newLocal(m_scriptState->isolate()));
         } else {