Remove some unused code in PhishingDOMFeatureExtractor.

chrome/renderer/safe_browsing/phishing_dom_feature_extractor.h

 // Copyright (c) 2011 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.
 //
 // PhishingDOMFeatureExtractor handles computing DOM-based features for the
 // client-side phishing detection model.  These include the presence of various
 // types of elements, ratios of external and secure links, and tokens for
 // external domains linked to.
 
 #ifndef CHROME_RENDERER_SAFE_BROWSING_PHISHING_DOM_FEATURE_EXTRACTOR_H_
@@ skipping 88 matching lines @@
   // builds.
   void CheckNoPendingExtraction();
 
   // Runs |done_callback_| and then clears all internal state.
   void RunCallback(bool success);
 
   // Clears all internal feature extraction state.
   void Clear();
 
   // Called after advancing |cur_document_| to update the state in
-  // |cur_frame_data_|.  Returns true if the state was updated successfully.
-  bool ResetFrameData();
+  // |cur_frame_data_|.
+  void ResetFrameData();
 
   // Returns the next document in frame-traversal order from cur_document_.
   // If there are no more documents, returns a null WebDocument.
   WebKit::WebDocument GetNextDocument();
 
   // Given a URL, checks whether the domain is different from the domain of
   // the current frame's URL.  If so, stores the domain in |domain| and returns
   // true, otherwise returns false.
   bool IsExternalDomain(const GURL& url, std::string* domain) const;
 
@@ skipping 27 matching lines @@
   // Used to create ExtractFeaturesWithTimeout tasks.
   // These tasks are revoked if extraction is cancelled.
   ScopedRunnableMethodFactory<PhishingDOMFeatureExtractor> method_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PhishingDOMFeatureExtractor);
 };
 
 }  // namespace safe_browsing
 
 #endif  // CHROME_RENDERER_SAFE_BROWSING_PHISHING_DOM_FEATURE_EXTRACTOR_H_