Remove some dead code.

core/fpdfdoc/cpdf_variabletext.cpp

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "core/fpdfapi/fpdf_font/include/cpdf_font.h"
 #include "core/fpdfdoc/cpvt_wordinfo.h"
 #include "core/fpdfdoc/csection.h"
 #include "core/fpdfdoc/include/cpdf_variabletext.h"
@@ skipping 1135 matching lines @@
 FX_BOOL CPDF_VariableText::IsLatinWord(uint16_t word) {
   return m_pVTProvider ? m_pVTProvider->IsLatinWord(word) : FALSE;
 }
 
 CPDF_VariableText::Iterator* CPDF_VariableText::GetIterator() {
   if (!m_pVTIterator)
     m_pVTIterator = new CPDF_VariableText::Iterator(this);
   return m_pVTIterator;
 }
 
-CPDF_VariableText::Provider* CPDF_VariableText::SetProvider(
-    CPDF_VariableText::Provider* pProvider) {
-  CPDF_VariableText::Provider* pOld = m_pVTProvider;
+void CPDF_VariableText::SetProvider(CPDF_VariableText::Provider* pProvider) {
   m_pVTProvider = pProvider;
-  return pOld;
 }