Revert of Work around a clang-cl devirtualization bug.

third_party/WebKit/Source/modules/payments/PaymentRequest.h

Index: third_party/WebKit/Source/modules/payments/PaymentRequest.h
diff --git a/third_party/WebKit/Source/modules/payments/PaymentRequest.h b/third_party/WebKit/Source/modules/payments/PaymentRequest.h
index b81a19b931e61ee058113f1830745a528032b012..5b2ea31c2faa055d646dd863c483a8b9c5023ac0 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentRequest.h
+++ b/third_party/WebKit/Source/modules/payments/PaymentRequest.h
@@ -31,8 +31,7 @@ class ScriptPromiseResolver;
 class ScriptState;
 class ShippingAddress;
 
-// TODO(thakis): Make this class final again once https://crbug.com/608705 is fixed.
-class MODULES_EXPORT PaymentRequest /* final */ : public EventTargetWithInlineData, WTF_NON_EXPORTED_BASE(public mojom::blink::PaymentRequestClient), public PaymentCompleter, public PaymentUpdater, public ContextLifecycleObserver {
+class MODULES_EXPORT PaymentRequest final : public EventTargetWithInlineData, WTF_NON_EXPORTED_BASE(public mojom::blink::PaymentRequestClient), public PaymentCompleter, public PaymentUpdater, public ContextLifecycleObserver {
     DEFINE_WRAPPERTYPEINFO();
     USING_GARBAGE_COLLECTED_MIXIN(PaymentRequest)
     WTF_MAKE_NONCOPYABLE(PaymentRequest);