[Bindings] Move and remove some private symbols from V8HiddenValue

third_party/WebKit/Source/modules/serviceworkers/FetchEvent.cpp

Index: third_party/WebKit/Source/modules/serviceworkers/FetchEvent.cpp
diff --git a/third_party/WebKit/Source/modules/serviceworkers/FetchEvent.cpp b/third_party/WebKit/Source/modules/serviceworkers/FetchEvent.cpp
index 3fa9d9054337147b290206fd70cd114701cf2ad5..f51d6f84554d5a5be1f6e19e27556752b8100859 100644
--- a/third_party/WebKit/Source/modules/serviceworkers/FetchEvent.cpp
+++ b/third_party/WebKit/Source/modules/serviceworkers/FetchEvent.cpp
@@ -6,7 +6,7 @@
 
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/ToV8.h"
-#include "bindings/core/v8/V8HiddenValue.h"
+#include "bindings/core/v8/V8PrivateProperty.h"
 #include "modules/fetch/BytesConsumerForDataConsumerHandle.h"
 #include "modules/fetch/Request.h"
 #include "modules/fetch/Response.h"
@@ -98,9 +98,8 @@ FetchEvent::FetchEvent(ScriptState* scriptState,
     DCHECK(event->IsObject());
     // Sets a hidden value in order to teach V8 the dependency from
     // the event to the request.
-    V8HiddenValue::setHiddenValue(
-        scriptState, event.As<v8::Object>(),
-        V8HiddenValue::requestInFetchEvent(scriptState->isolate()), request);
+    V8PrivateProperty::getFetchEventRequest(scriptState->isolate())
+        .set(event.As<v8::Object>(), request);
     // From the same reason as above, setHiddenValue can return false.
     // TODO(yhirano): Add an assertion that it returns true once the
     // graceful shutdown mechanism is introduced.