Fix and enable lint checks.

fpdfsdk/src/javascript/JS_Runtime_Stub.cpp

 // Copyright 2015 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 <memory>
 
 #include "fpdfsdk/include/fsdk_mgr.h"  // For CPDFDoc_Environment.
 #include "fpdfsdk/include/javascript/IJavaScript.h"
@@ skipping 120 matching lines @@
 
   IJS_Context* GetCurrentContext() override { return m_pContext.get(); }
   void ReleaseContext(IJS_Context* pContext) override {}
 
   void SetReaderDocument(CPDFSDK_Document* pReaderDoc) override {
     m_pDoc = pReaderDoc;
   }
   CPDFSDK_Document* GetReaderDocument() override { return m_pDoc; }
 
 #ifdef PDF_ENABLE_XFA
-  virtual FX_BOOL GetHValueByName(const CFX_ByteStringC&,
-                                  FXJSE_HVALUE) override {
+  FX_BOOL GetHValueByName(const CFX_ByteStringC&, FXJSE_HVALUE) override {
     return FALSE;
   }
 
-  virtual FX_BOOL SetHValueByName(const CFX_ByteStringC&,
-                                  FXJSE_HVALUE) override {
+  FX_BOOL SetHValueByName(const CFX_ByteStringC&, FXJSE_HVALUE) override {
     return FALSE;
   }
 #endif  // PDF_ENABLE_XFA
 
   int Execute(IJS_Context* cc,
               const wchar_t* script,
               CFX_WideString* info) override {
     return 0;
   }
 
  protected:
   CPDFSDK_Document* m_pDoc;
   std::unique_ptr<CJS_ContextStub> m_pContext;
 };
 
 // static
 void IJS_Runtime::Initialize(unsigned int slot, void* isolate) {
 }
 
 // static
 IJS_Runtime* IJS_Runtime::Create(CPDFDoc_Environment* pEnv) {
   return new CJS_RuntimeStub;
 }