Use ExecutionContext instead of Document in PaymentRequest constructor.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PaymentCompleter_h
 #define PaymentCompleter_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "modules/ModulesExport.h"
 #include "platform/heap/GarbageCollected.h"
 
 namespace blink {
 
-class ScriptState;
-
 class MODULES_EXPORT PaymentCompleter : public GarbageCollectedMixin {
  public:
   enum PaymentComplete { Success, Fail, Unknown };
 
-  virtual ScriptPromise complete(ScriptState*, PaymentComplete result) = 0;
+  virtual ScriptPromise complete(PaymentComplete result) = 0;
 
  protected:
   virtual ~PaymentCompleter() {}
 };
 
 }  // namespace blink
 
 #endif  // PaymentCompleter_h