Remove dead code in spell checker

chrome/renderer/spellchecker/spellcheck_provider.h

 // Copyright (c) 2012 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 CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_PROVIDER_H_
 #define CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_PROVIDER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 62 matching lines @@
 
   // RenderViewObserver implementation.
   void OnDestruct() override;
 
   // blink::WebSpellCheckClient implementation.
   void spellCheck(
       const blink::WebString& text,
       int& offset,
       int& length,
       blink::WebVector<blink::WebString>* optional_suggestions) override;
-  void checkTextOfParagraph(
-      const blink::WebString& text,
-      blink::WebTextCheckingTypeMask mask,
-      blink::WebVector<blink::WebTextCheckingResult>* results) override;
 
   void requestCheckingOfText(
       const blink::WebString& text,
       const blink::WebVector<uint32_t>& markers,
       const blink::WebVector<unsigned>& marker_offsets,
       blink::WebTextCheckingCompletion* completion) override;
 
   void showSpellingUI(bool show) override;
   bool isShowingSpellingUI() override;
   void updateSpellingUIWithMisspelledWord(
@@ skipping 31 matching lines @@
   // True if the browser is showing the spelling panel for us.
   bool spelling_panel_visible_;
 
   // Weak pointer to shared (per RenderView) spellcheck data.
   SpellCheck* spellcheck_;
 
   DISALLOW_COPY_AND_ASSIGN(SpellCheckProvider);
 };
 
 #endif  // CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_PROVIDER_H_