Remove explicit "mkdir -p" from Android postlink command

build/toolchain/android/BUILD.gn

 # Copyright 2013 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/sysroot.gni")  # Imports android/config.gni.
 import("//build/toolchain/ccache.gni")
 import("//build/toolchain/clang.gni")
 import("//build/toolchain/goma.gni")
 import("//build/toolchain/gcc_toolchain.gni")
 
@@ skipping 46 matching lines @@
 
     # We make the assumption that the gcc_toolchain will produce a soname with
     # the following definition.
     soname = "{{target_output_name}}{{output_extension}}"
 
     stripped_soname = "lib.stripped/${soname}"
     temp_stripped_soname = "${stripped_soname}.tmp"
 
     android_strip = "${tool_prefix}strip"
 
-    mkdir_command = "mkdir -p lib.stripped"
     strip_command =
         "$android_strip --strip-unneeded -o $temp_stripped_soname $soname"
     replace_command = "if ! cmp -s $temp_stripped_soname $stripped_soname; then mv $temp_stripped_soname $stripped_soname; fi"
-    postsolink = "$mkdir_command && $strip_command && $replace_command"
+    postsolink = "$strip_command && $replace_command"
     solink_outputs = [ stripped_soname ]
 
     # We make the assumption that the gcc_toolchain will produce an exe with
     # the following definition.
     exe = "{{root_out_dir}}/{{target_output_name}}{{output_extension}}"
     stripped_exe = "exe.stripped/$exe"
-    mkdir_command = "mkdir -p exe.stripped"
-    strip_command = "$android_strip --strip-unneeded -o $stripped_exe $exe"
-    postlink = "$mkdir_command && $strip_command"
+    postlink = "$android_strip --strip-unneeded -o $stripped_exe $exe"
     link_outputs = [ stripped_exe ]
   }
 }
 
 android_gcc_toolchain("x86") {
   android_ndk_sysroot = "$android_ndk_root/$x86_android_sysroot_subdir"
   android_ndk_lib_dir = "usr/lib"
 
   tool_prefix = "$x86_android_toolchain_root/bin/i686-linux-android-"
   toolchain_cpu = "x86"
@@ skipping 31 matching lines @@
   toolchain_cpu = "aarch64"
 }
 
 android_gcc_toolchain("mips64el") {
   android_ndk_sysroot = "$android_ndk_root/$mips64_android_sysroot_subdir"
   android_ndk_lib_dir = "usr/lib64"
 
   tool_prefix = "$mips64_android_toolchain_root/bin/mipsel-linux-android-"
   toolchain_cpu = "mipsel64el"
 }