Android: Prefix target toolchain names with "android_".

build/config/android/config.gni

 # 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.
 
 # This file contains common system config stuff for the Android build.
 
 if (is_android) {
   assert(rebase_path("//", root_build_dir) == "../../",
          "Android output directory must be nested 2 levels within src/ (" +
              "e.g.: out-gn/Debug). http://crbug.com/412935")
@@ skipping 316 matching lines @@
     android_secondary_abi_cpu = "x86"
     android_app_secondary_abi = "x86"
   } else if (target_cpu == "mips64el") {
     android_secondary_abi_cpu = "mipsel"
     android_app_secondary_abi = "mips"
   }
 
   if (defined(android_secondary_abi_cpu)) {
     if (is_clang) {
       android_secondary_abi_toolchain =
-          "//build/toolchain/android:clang_${android_secondary_abi_cpu}"
+          "//build/toolchain/android:android_clang_${android_secondary_abi_cpu}"
     } else {
       android_secondary_abi_toolchain =
-          "//build/toolchain/android:${android_secondary_abi_cpu}"
+          "//build/toolchain/android:android_${android_secondary_abi_cpu}"
     }
   }
 }
 
 declare_args() {
   # Enables used resource whitelist generation. Set for official builds only
   # as a large amount of build output is generated.
   enable_resource_whitelist_generation = is_android && is_official_build
 }