Revert of Implement arflags in the GN build.

build/config/posix/BUILD.gn

Index: build/config/posix/BUILD.gn
diff --git a/build/config/posix/BUILD.gn b/build/config/posix/BUILD.gn
index c4198200862c9e805a98e09966d8f2c73230ef76..fc5dd432103365e1b796e45f94c4a2603476c55f 100644
--- a/build/config/posix/BUILD.gn
+++ b/build/config/posix/BUILD.gn
@@ -2,28 +2,12 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/sysroot.gni")
-import("//build/toolchain/toolchain.gni")
 
 assert(is_posix)
 
 group("posix") {
   visibility = [ "//:optimize_gn_gen" ]
-}
-
-# This is included by reference in the //build/config/compiler config that
-# is applied to all Posix targets. It is here to separate out the logic that is
-# Posix-only. Note that this is in addition to an OS-specific variant of this
-# config.
-config("compiler") {
-  if ((allow_posix_link_time_opt || is_cfi) && !is_nacl) {
-    arflags = [
-      "--plugin",
-      rebase_path("//third_party/llvm-build/Release+Asserts/lib/LLVMgold.so",
-                  root_build_dir),
-    ]
-  }
 }
 
 # This is included by reference in the //build/config/compiler:runtime_library