Review and cleanup lint warnings.

fpdfsdk/include/fx_systemhandler.h

 // Copyright 2014 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
 
 #ifndef FPDFSDK_INCLUDE_FX_SYSTEMHANDLER_H_
 #define FPDFSDK_INCLUDE_FX_SYSTEMHANDLER_H_
 
 #include "core/include/fpdfapi/fpdf_parser.h"
@@ skipping 37 matching lines @@
 
 class IFX_SystemHandler {
  public:
   virtual ~IFX_SystemHandler() {}
   virtual void InvalidateRect(FX_HWND hWnd, FX_RECT rect) = 0;
   virtual void OutputSelectedRect(void* pFormFiller, CFX_FloatRect& rect) = 0;
 
   virtual FX_BOOL IsSelectionImplemented() = 0;
 
   virtual CFX_WideString GetClipboardText(FX_HWND hWnd) = 0;
-  virtual FX_BOOL SetClipboardText(FX_HWND hWnd, CFX_WideString string) = 0;
+  virtual FX_BOOL SetClipboardText(FX_HWND hWnd, CFX_WideString str) = 0;
 
   virtual void ClientToScreen(FX_HWND hWnd, int32_t& x, int32_t& y) = 0;
   virtual void ScreenToClient(FX_HWND hWnd, int32_t& x, int32_t& y) = 0;
 
   /*cursor style
   FXCT_ARROW
   FXCT_NESW
   FXCT_NWSE
   FXCT_VBEAM
   FXCT_HBEAM
   FXCT_HAND
   */
   virtual void SetCursor(int32_t nCursorType) = 0;
 
   virtual FX_HMENU CreatePopupMenu() = 0;
   virtual FX_BOOL AppendMenuItem(FX_HMENU hMenu,
                                  int32_t nIDNewItem,
-                                 CFX_WideString string) = 0;
+                                 CFX_WideString str) = 0;
   virtual FX_BOOL EnableMenuItem(FX_HMENU hMenu,
                                  int32_t nIDItem,
                                  FX_BOOL bEnabled) = 0;
   virtual int32_t TrackPopupMenu(FX_HMENU hMenu,
                                  int32_t x,
                                  int32_t y,
                                  FX_HWND hParent) = 0;
   virtual void DestroyMenu(FX_HMENU hMenu) = 0;
 
   virtual CFX_ByteString GetNativeTrueTypeFont(int32_t nCharset) = 0;
@@ skipping 11 matching lines @@
   virtual FX_BOOL IsALTKeyDown(FX_DWORD nFlag) = 0;
   virtual FX_BOOL IsINSERTKeyDown(FX_DWORD nFlag) = 0;
 
   virtual FX_SYSTEMTIME GetLocalTime() = 0;
 
   virtual int32_t GetCharSet() = 0;
   virtual void SetCharSet(int32_t nCharSet) = 0;
 };
 
 #endif  // FPDFSDK_INCLUDE_FX_SYSTEMHANDLER_H_