Oilpan: Replace most of RefPtrs for Event objects with oilpan's transition types

Source/web/tests/KeyboardTest.cpp

Index: Source/web/tests/KeyboardTest.cpp
diff --git a/Source/web/tests/KeyboardTest.cpp b/Source/web/tests/KeyboardTest.cpp
index b2fce99db7c202d01539bd1600997e9944975ed4..df584260bdf04371a3daa9e3953c1befc410ce8e 100644
--- a/Source/web/tests/KeyboardTest.cpp
+++ b/Source/web/tests/KeyboardTest.cpp
@@ -58,7 +58,7 @@ public:
     {
         PlatformKeyboardEventBuilder evt(webKeyboardEvent);
         evt.setKeyType(keyType);
-        RefPtr<KeyboardEvent> keyboardEvent = KeyboardEvent::create(evt, 0);
+        RefPtrWillBeRawPtr<KeyboardEvent> keyboardEvent = KeyboardEvent::create(evt, 0);
         OwnPtr<Settings> settings = Settings::create();
         EditingBehavior behavior(settings->editingBehaviorType());
         return behavior.interpretKeyEvent(*keyboardEvent);