| Index: base/files/memory_mapped_file.cc | 
| diff --git a/base/files/memory_mapped_file.cc b/base/files/memory_mapped_file.cc | 
| index 745a5ff1f4524f944823c244249836b6b52bf9a3..891fcffc4cb434b74729657b7981a400729f2e61 100644 | 
| --- a/base/files/memory_mapped_file.cc | 
| +++ b/base/files/memory_mapped_file.cc | 
| @@ -31,6 +31,7 @@ MemoryMappedFile::~MemoryMappedFile() { | 
| CloseHandles(); | 
| } | 
|  | 
| +#if !defined(OS_NACL) | 
| bool MemoryMappedFile::Initialize(const FilePath& file_name) { | 
| if (IsValid()) | 
| return false; | 
| @@ -85,5 +86,6 @@ void MemoryMappedFile::CalculateVMAlignedBoundaries(int64 start, | 
| *aligned_start = start & ~mask; | 
| *aligned_size = (size + *offset + mask) & ~mask; | 
| } | 
| +#endif | 
|  | 
| }  // namespace base | 
|  |