Revert of Reland "Integrate SIMD optimisations for zlib"

third_party/zlib/README.chromium

 Name: zlib
 URL: http://zlib.net/
 Version: 1.2.5
 Security Critical: yes
 License: Custom license
 License Android Compatible: yes
 
 Description:
 General purpose compression library
 
 Local Modifications:
 A few minor changes, all marked with "Google":
 - Added #ifdefs to avoid compile warnings when NO_GZCOMPRESS is defined.
 - Removed use of strerror for WinCE in gzio.c.
 - Added 'int z_errno' global for WinCE, to which 'errno' is defined in zutil.h.
 - Added 'mozzconf.h' to mangle the function names.
 - Added logic in zlib.h to undef our earlier mangles when defaulting to 64 bit offset versions of API.
 The 'google.patch' file represents our changes from the original zlib-1.2.5.
 
 A more significant change to support mixed-source data compression. See
 crbug.com/139744 and mixed-source.patch.
-
-Integrated Intel SIMD optimisations from: https://github.com/jtkukunas/zlib/
-and modified to accomodate the older version and existing changes in tree.
-
-This introduces new files: simd_stub.c, crc_folding.c, fill_window_sse.c and
-x86.[ch]. All but the latter are built into a static library to allow the
-compiler to use the desired instructions only when valid. The latter version is
-only built on x86 (32-bit and 64-bit) systems with it's functionality stubbed
-on the others.
-
-Other changes to accomodate:
-- fill_window() implementation calls into _sse() variant when supported and the
-  original implementation renamed to _c()
-- read_buf was moved from local to ZLIB_INTERNAL for fill_window_sse.c to use
-- INSERT_STRING macro was made a function, insert_string() and an implementation using CRC instruction added
-- some crc funcionality moved into crc32.c