Keep only base/extractor.[cc|h].

third_party/lzma/v4_65/files/CPP/7zip/UI/Common/ExitCode.h

-// ExitCode.h
-
-#ifndef __EXIT_CODE_H
-#define __EXIT_CODE_H
-
-namespace NExitCode {
-
-enum EEnum {
-
-  kSuccess       = 0,     // Successful operation
-  kWarning       = 1,     // Non fatal error(s) occurred
-  kFatalError    = 2,     // A fatal error occurred
-  // kCRCError      = 3,     // A CRC error occurred when unpacking
-  // kLockedArchive = 4,     // Attempt to modify an archive previously locked
-  // kWriteError    = 5,     // Write to disk error
-  // kOpenError     = 6,     // Open file error
-  kUserError     = 7,     // Command line option error
-  kMemoryError   = 8,     // Not enough memory for operation
-  // kCreateFileError = 9,     // Create file error
-  
-  kUserBreak     = 255   // User stopped the process
-
-};
-
-}
-
-#endif