Enable libc++ on Android

tools/clang/scripts/update.sh

 #!/usr/bin/env 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.
 
 # This script will check out llvm and clang into third_party/llvm and build it.
 
 # Do NOT CHANGE this if you don't know what you're doing -- see
 # https://code.google.com/p/chromium/wiki/UpdatingClang
 # Reverting problematic clang rolls is safe, though.
@@ skipping 886 matching lines @@
 fi
 
 popd
 
 if [[ -n "${with_android}" ]]; then
   # Make a standalone Android toolchain.
   ${ANDROID_NDK_DIR}/build/tools/make-standalone-toolchain.sh \
       --platform=android-14 \
       --install-dir="${LLVM_BUILD_DIR}/android-toolchain" \
       --system=linux-x86_64 \
-      --stl=stlport \
+      --stl=libcxx \
       --toolchain=arm-linux-androideabi-4.9
 
   # Android NDK r9d copies a broken unwind.h into the toolchain, see
   # http://crbug.com/357890
   rm -v "${LLVM_BUILD_DIR}"/android-toolchain/include/c++/*/unwind.h
 
   # Build ASan runtime for Android in a separate build tree.
   mkdir -p ${LLVM_BUILD_DIR}/android
   pushd ${LLVM_BUILD_DIR}/android
   rm -fv CMakeCache.txt
@@ skipping 17 matching lines @@
 
 if [[ -n "$run_tests" ]]; then
   # Run Chrome tool tests.
   ninja -C "${LLVM_BUILD_DIR}" cr-check-all
   # Run the LLVM and Clang tests.
   ninja -C "${LLVM_BUILD_DIR}" check-all
 fi
 
 # After everything is done, log success for this revision.
 echo "${CLANG_AND_PLUGINS_REVISION}" > "${STAMP_FILE}"