Revert of Integrate SIMD optimisations for zlib

third_party/zlib/BUILD.gn

Index: third_party/zlib/BUILD.gn
diff --git a/third_party/zlib/BUILD.gn b/third_party/zlib/BUILD.gn
index 18cf816397c05839f3f2d76f981fa95e0ee42a36..0f21450e38bc65c62cbe1fccf0d5e884206370b3 100644
--- a/third_party/zlib/BUILD.gn
+++ b/third_party/zlib/BUILD.gn
@@ -4,15 +4,6 @@
 
 config("zlib_config") {
   include_dirs = [ "." ]
-}
-
-static_library("zlib_x86_simd") {
-  if (cpu_arch == "x86" || cpu_arch == "x64") {
-    sources = [ "crc_folding.c", "fill_window_sse.c" ]
-    cflags = [ "-msse2", "-msse4.2", "-mpclmul" ]
-  } else {
-    sources = [ "simd_stub.c"]
-  }
 }
 
 static_library("zlib") {
@@ -45,22 +36,16 @@
     "trees.c",
     "trees.h",
     "uncompr.c",
-    "x86.h",
     "zconf.h",
     "zlib.h",
     "zutil.c",
     "zutil.h",
   ]
 
-  if (cpu_arch == "x86" || cpu_arch == "x64") {
-    sources += [ "x86.c" ]
-  }
-
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
 
   public_configs = [ ":zlib_config" ]
-  deps = [ ":zlib_x86_simd" ]
 }
 
 static_library("minizip") {