Simplify PDFium by removing code that's not used in the open source repo.

core/src/fxcodec/libjpeg/jmemsys.h

Index: core/src/fxcodec/libjpeg/jmemsys.h
diff --git a/core/src/fxcodec/libjpeg/jmemsys.h b/core/src/fxcodec/libjpeg/jmemsys.h
index ef1481514b06576a6f49f419b28755f78350219b..896688181bf54b9ba0f10224a5a4c2ef42c9c099 100644
--- a/core/src/fxcodec/libjpeg/jmemsys.h
+++ b/core/src/fxcodec/libjpeg/jmemsys.h
@@ -12,10 +12,7 @@
  *
  * This file works as-is for the system-dependent memory managers supplied
  * in the IJG distribution.  You may need to modify it if you write a
- * custom memory manager.  If system-dependent changes are needed in
- * this file, the best method is to #ifdef them based on a configuration
- * symbol supplied in jconfig.h, as we have done with USE_MSDOS_MEMMGR
- * and USE_MAC_MEMMGR.
+ * custom memory manager.
  */
 
 
@@ -115,25 +112,6 @@ EXTERN(long) jpeg_mem_available JPP((j_common_ptr cinfo,
 
 #define TEMP_NAME_LENGTH   64	/* max length of a temporary file's name */
 
-
-#ifdef USE_MSDOS_MEMMGR		/* DOS-specific junk */
-
-typedef unsigned short XMSH;	/* type of extended-memory handles */
-typedef unsigned short EMSH;	/* type of expanded-memory handles */
-
-typedef union {
-  short file_handle;		/* DOS file handle if it's a temp file */
-  XMSH xms_handle;		/* handle if it's a chunk of XMS */
-  EMSH ems_handle;		/* handle if it's a chunk of EMS */
-} handle_union;
-
-#endif /* USE_MSDOS_MEMMGR */
-
-#ifdef USE_MAC_MEMMGR		/* Mac-specific junk */
-#include <Files.h>
-#endif /* USE_MAC_MEMMGR */
-
-
 typedef struct backing_store_struct * backing_store_ptr;
 
 typedef struct backing_store_struct {
@@ -150,24 +128,9 @@ typedef struct backing_store_struct {
 				      backing_store_ptr info));
 
   /* Private fields for system-dependent backing-store management */
-#ifdef USE_MSDOS_MEMMGR
-  /* For the MS-DOS manager (jmemdos.c), we need: */
-  handle_union handle;		/* reference to backing-store storage object */
-  char temp_name[TEMP_NAME_LENGTH]; /* name if it's a file */
-#else
-#ifdef USE_MAC_MEMMGR
-  /* For the Mac manager (jmemmac.c), we need: */
-  short temp_file;		/* file reference number to temp file */
-  FSSpec tempSpec;		/* the FSSpec for the temp file */
-  char temp_name[TEMP_NAME_LENGTH]; /* name if it's a file */
-#else
   /* For a typical implementation with temp files, we need: */
-#ifndef _FPDFAPI_MINI_
   FXSYS_FILE * temp_file;		/* stdio reference to temp file */
   char temp_name[TEMP_NAME_LENGTH]; /* name of temp file */
-#endif
-#endif
-#endif
 } backing_store_info;