android envsetup: Don't set script-local variable toolchain_dir.

build/android/envsetup.sh

 #!/bin/bash
 # Copyright (c) 2012 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.
 
 # Sets up environment for building Chromium on Android.  It can either be
 # compiled with the Android tree or using the Android SDK/NDK. To build with
 # NDK/SDK: ". build/android/envsetup.sh".  Environment variable
 # ANDROID_SDK_BUILD=1 will then be defined and used in the rest of the setup to
 # specifiy build type.
@@ skipping 31 matching lines @@
   i?86)
     echo "ERROR: Android build requires a 64-bit host build machine."
     return 1
     ;;
   *)
     echo "ERROR: Unsupported host architecture (${host_arch})."
     echo "Try running this script on a Linux/x86_64 machine instead."
     return 1
 esac
 
-case "${host_os}" in
-  "linux")
-    toolchain_dir="linux-${host_arch}"
-    ;;
-  "mac")
-    toolchain_dir="darwin-${host_arch}"
-    ;;
-  *)
-    echo "Host platform ${host_os} is not supported" >& 2
-    return 1
-esac
-
 CURRENT_DIR="$(readlink -f "${SCRIPT_DIR}/../../")"
 if [[ -z "${CHROME_SRC}" ]]; then
   # If $CHROME_SRC was not set, assume current directory is CHROME_SRC.
   export CHROME_SRC="${CURRENT_DIR}"
 fi
 
 if [[ "${CURRENT_DIR/"${CHROME_SRC}"/}" == "${CURRENT_DIR}" ]]; then
   # If current directory is not in $CHROME_SRC, it might be set for other
   # source tree. If $CHROME_SRC was set correctly and we are in the correct
   # directory, "${CURRENT_DIR/"${CHROME_SRC}"/}" will be "".
@@ skipping 31 matching lines @@
 export GYP_CROSSCOMPILE=1
 
 # Performs a gyp_chromium run to convert gyp->Makefile for android code.
 android_gyp() {
   # This is just a simple wrapper of gyp_chromium, please don't add anything
   # in this function.
   (
     "${CHROME_SRC}/build/gyp_chromium" --depth="${CHROME_SRC}" --check "$@"
   )
 }