Remove unused helpers to selectively traverse through only local frames.

third_party/WebKit/Source/web/WebLocalFrameImpl.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 185 matching lines @@
     WebString layerTreeAsText(bool showDebugInfo = false) const override;
 
     WebFrameImplBase* toImplBase() override { return this; }
 
     // WebLocalFrame methods:
     void setAutofillClient(WebAutofillClient*) override;
     WebAutofillClient* autofillClient() override;
     void setDevToolsAgentClient(WebDevToolsAgentClient*) override;
     WebDevToolsAgent* devToolsAgent() override;
     WebLocalFrameImpl* localRoot() override;
-    WebLocalFrame* traversePreviousLocal(bool wrap) const override;
-    WebLocalFrame* traverseNextLocal(bool wrap) const override;
     void sendPings(const WebURL& destinationURL) override;
     bool dispatchBeforeUnloadEvent(bool) override;
     WebURLRequest requestFromHistoryItem(const WebHistoryItem&, WebCachePolicy) const override;
     WebURLRequest requestForReload(WebFrameLoadType, const WebURL&) const override;
     void load(const WebURLRequest&, WebFrameLoadType, const WebHistoryItem&,
         WebHistoryLoadType, bool isClientRedirect) override;
     void loadData(
         const WebData&, const WebString& mimeType, const WebString& textEncoding,
         const WebURL& baseURL, const WebURL& unreachableURL, bool replace, WebFrameLoadType,
         const WebHistoryItem&, WebHistoryLoadType, bool isClientRedirect) override;
@@ skipping 180 matching lines @@
     // Accomplish that by keeping a self-referential Persistent<>. It is
     // cleared upon close().
     SelfKeepAlive<WebLocalFrameImpl> m_selfKeepAlive;
 };
 
 DEFINE_TYPE_CASTS(WebLocalFrameImpl, WebFrame, frame, frame->isWebLocalFrame(), frame.isWebLocalFrame());
 
 } // namespace blink
 
 #endif