[Oilpan] Prepare full definition of classes before using Member

third_party/WebKit/Source/web/WebRemoteFrameImpl.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebRemoteFrameImpl_h
 #define WebRemoteFrameImpl_h
 
 #include "core/frame/FrameOwner.h"
 #include "platform/heap/Handle.h"
 #include "public/web/WebRemoteFrame.h"
@@ skipping 155 matching lines @@
 
     bool selectionStartHasSpellingMarkerFor(int from, int length) const override;
     WebString layerTreeAsText(bool showDebugInfo = false) const override;
 
     WebLocalFrame* createLocalChild(WebTreeScopeType, const WebString& name, WebSandboxFlags, WebFrameClient*, WebFrame* previousSibling, const WebFrameOwnerProperties&) override;
     WebRemoteFrame* createRemoteChild(WebTreeScopeType, const WebString& name, WebSandboxFlags, WebRemoteFrameClient*) override;
 
     void initializeCoreFrame(FrameHost*, FrameOwner*, const AtomicString& name);
 
     void setCoreFrame(PassRefPtrWillBeRawPtr<RemoteFrame>);
-    RemoteFrame* frame() const { return m_frame.get(); }
+    RemoteFrame* frame() const;
 
     WebRemoteFrameClient* client() const { return m_client; }
 
     static WebRemoteFrameImpl* fromFrame(RemoteFrame&);
 
     void initializeFromFrame(WebLocalFrame*) const override;
 
     void setReplicatedOrigin(const WebSecurityOrigin&) const override;
     void setReplicatedSandboxFlags(WebSandboxFlags) const override;
     void setReplicatedName(const WebString&) const override;
@@ skipping 21 matching lines @@
     // cleared upon close().
     SelfKeepAlive<WebRemoteFrameImpl> m_selfKeepAlive;
 #endif
 };
 
 DEFINE_TYPE_CASTS(WebRemoteFrameImpl, WebFrame, frame, frame->isWebRemoteFrame(), frame.isWebRemoteFrame());
 
 } // namespace blink
 
 #endif // WebRemoteFrameImpl_h