Fix for default value of FetchEvent.cancellable

Source/modules/serviceworkers/FetchEvent.cpp

Index: Source/modules/serviceworkers/FetchEvent.cpp
diff --git a/Source/modules/serviceworkers/FetchEvent.cpp b/Source/modules/serviceworkers/FetchEvent.cpp
index 625809d23bb227614629dca0f95dbad732df4675..2c1db23b870a63a164152f5c93bfa92ce629bc36 100644
--- a/Source/modules/serviceworkers/FetchEvent.cpp
+++ b/Source/modules/serviceworkers/FetchEvent.cpp
@@ -16,15 +16,13 @@ PassRefPtrWillBeRawPtr<FetchEvent> FetchEvent::create()
     return adoptRefWillBeNoop(new FetchEvent());
 }
 
-PassRefPtrWillBeRawPtr<FetchEvent> FetchEvent::create(const AtomicString& type, FetchEventInit& initializer)
+PassRefPtrWillBeRawPtr<FetchEvent> FetchEvent::create(const AtomicString& type, const FetchEventInit& initializer)
 {
-    initializer.setCancelable(true);
     return adoptRefWillBeNoop(new FetchEvent(type, initializer, nullptr));
 }
 
-PassRefPtrWillBeRawPtr<FetchEvent> FetchEvent::create(const AtomicString& type, FetchEventInit& initializer, RespondWithObserver* observer)
+PassRefPtrWillBeRawPtr<FetchEvent> FetchEvent::create(const AtomicString& type, const FetchEventInit& initializer, RespondWithObserver* observer)
 {
-    initializer.setCancelable(true);
     return adoptRefWillBeNoop(new FetchEvent(type, initializer, observer));
 }