Fix and enable lint checks.

fpdfsdk/src/javascript/JS_Runtime_Stub.cpp

Index: fpdfsdk/src/javascript/JS_Runtime_Stub.cpp
diff --git a/fpdfsdk/src/javascript/JS_Runtime_Stub.cpp b/fpdfsdk/src/javascript/JS_Runtime_Stub.cpp
index e9d5a221f7381e9617e04aaebc740c775a9d1042..ab20e0e365c01a4d134b6a2b101da163de3c6e82 100644
--- a/fpdfsdk/src/javascript/JS_Runtime_Stub.cpp
+++ b/fpdfsdk/src/javascript/JS_Runtime_Stub.cpp
@@ -138,13 +138,11 @@ class CJS_RuntimeStub final : public IJS_Runtime {
   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