Oilpan: make FrameLoadRequest be a stack allocated object.

Source/core/loader/FrameLoadRequest.h

Index: Source/core/loader/FrameLoadRequest.h
diff --git a/Source/core/loader/FrameLoadRequest.h b/Source/core/loader/FrameLoadRequest.h
index 2e01a016195735738664c1c7f49f6021bd1de3ba..02ed53053853c0fc481ed8f630d3bc2f1f2c6c99 100644
--- a/Source/core/loader/FrameLoadRequest.h
+++ b/Source/core/loader/FrameLoadRequest.h
@@ -37,6 +37,7 @@ namespace WebCore {
 class LocalFrame;
 
 struct FrameLoadRequest {
+    STACK_ALLOCATED();
 public:
     explicit FrameLoadRequest(Document* originDocument)
         : m_originDocument(originDocument)
@@ -101,14 +102,14 @@ public:
     void setShouldSendReferrer(ShouldSendReferrer shouldSendReferrer) { m_shouldSendReferrer = shouldSendReferrer; }
 
 private:
-    RefPtrWillBePersistent<Document> m_originDocument;
+    RefPtrWillBeMember<Document> m_originDocument;
     ResourceRequest m_resourceRequest;
     AtomicString m_frameName;
     SubstituteData m_substituteData;
     bool m_lockBackForwardList;
     ClientRedirectPolicy m_clientRedirect;
-    RefPtrWillBePersistent<Event> m_triggeringEvent;
-    RefPtrWillBePersistent<FormState> m_formState;
+    RefPtrWillBeMember<Event> m_triggeringEvent;
+    RefPtrWillBeMember<FormState> m_formState;
     ShouldSendReferrer m_shouldSendReferrer;
 };