Release Oilpan heap singletons prior to LSan leak detection.

third_party/WebKit/Source/bindings/core/v8/RejectedPromises.h

Index: third_party/WebKit/Source/bindings/core/v8/RejectedPromises.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/RejectedPromises.h b/third_party/WebKit/Source/bindings/core/v8/RejectedPromises.h
index a839fc9eaf2f658de4639870b0978dccdf46a1b2..9dc62c4e9198b877e6294654c0e85e98c77eca0e 100644
--- a/third_party/WebKit/Source/bindings/core/v8/RejectedPromises.h
+++ b/third_party/WebKit/Source/bindings/core/v8/RejectedPromises.h
@@ -26,7 +26,6 @@ public:
         return adoptRefWillBeNoop(new RejectedPromises);
     }
 
-    RejectedPromises();
     void dispose();
     DECLARE_TRACE();
 
@@ -38,8 +37,9 @@ public:
 private:
     class Message;
 
-    using MessageQueue = WillBeHeapDeque<OwnPtrWillBeMember<Message>>;
+    RejectedPromises();
 
+    using MessageQueue = WillBeHeapDeque<OwnPtrWillBeMember<Message>>;
     PassOwnPtrWillBeRawPtr<MessageQueue> createMessageQueue();
 
     void processQueueNow(PassOwnPtrWillBeRawPtr<MessageQueue>);