Fix and enable lint checks.

core/include/fxcrt/fx_memory.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 CORE_INCLUDE_FXCRT_FX_MEMORY_H_
 #define CORE_INCLUDE_FXCRT_FX_MEMORY_H_
 
 #include "core/include/fxcrt/fx_system.h"
@@ skipping 80 matching lines @@
   }
 
   void* Alloc(size_t size);
 
   void* ReallocDebug(void* p, size_t new_size, const FX_CHAR* file, int line) {
     return NULL;
   }
 
   void* Realloc(void* p, size_t new_size) { return NULL; }
 
-  void Free(void*) {}
+  void Free(void* mem) {}
 
   void FreeAll();
 
  private:
   size_t m_TrunkSize;
 
   void* m_pFirstTrunk;
 };
 #endif  // __cplusplus
 
 #endif  // CORE_INCLUDE_FXCRT_FX_MEMORY_H_