Clean up default toolchain logic for CrOS GN builds.

build/toolchain/cros/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/compiler/compiler.gni")
 import("//build/config/sysroot.gni")
 import("//build/toolchain/gcc_toolchain.gni")
 import("//build/toolchain/cros_toolchain.gni")
 
-# TODO(dpranke): Delete this after we get rid of the reference to
-# build/toolchain/cros:clang_target in BUILDCONFIG.gn
-clang_toolchain("clang_target") {
-  toolchain_cpu = target_cpu
-  toolchain_os = "linux"
-}
-
 template("cros_target_toolchain") {
   if (defined(invoker.use_debug_fission)) {
     use_debug_fission = invoker.use_debug_fission
   }
   if (defined(invoker.use_gold)) {
     use_gold = invoker.use_gold
   }
   if (defined(invoker.use_sysroot)) {
     use_sysroot = invoker.use_sysroot
   }
@@ skipping 97 matching lines @@
   is_clang = cros_v8_snapshot_is_clang
   if (target_cpu == "x86" || target_cpu == "arm" || target_cpu == "mipsel") {
     toolchain_cpu = "x86"
   } else {
     toolchain_cpu = "x64"
   }
   v8_toolchain_cpu = v8_target_cpu
   toolchain_os = "linux"
   use_sysroot = false
 }