Have ScriptPromiseResolver on the Oilpan heap always.

Source/modules/serviceworkers/ServiceWorkerWindowClient.cpp

Index: Source/modules/serviceworkers/ServiceWorkerWindowClient.cpp
diff --git a/Source/modules/serviceworkers/ServiceWorkerWindowClient.cpp b/Source/modules/serviceworkers/ServiceWorkerWindowClient.cpp
index ccc3c42ec05dc8530b038c3cb69394f864de5a58..d23b7fbf9a44dd785d410e3cd519e29fa4c0e164 100644
--- a/Source/modules/serviceworkers/ServiceWorkerWindowClient.cpp
+++ b/Source/modules/serviceworkers/ServiceWorkerWindowClient.cpp
@@ -47,7 +47,7 @@ String ServiceWorkerWindowClient::visibilityState() const
 
 ScriptPromise ServiceWorkerWindowClient::focus(ScriptState* scriptState)
 {
-    RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
 
     if (!scriptState->executionContext()->isWindowInteractionAllowed()) {
@@ -62,7 +62,7 @@ ScriptPromise ServiceWorkerWindowClient::focus(ScriptState* scriptState)
 
 ScriptPromise ServiceWorkerWindowClient::navigate(ScriptState* scriptState, const String& url)
 {
-    RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
     ExecutionContext* context = scriptState->executionContext();