[Android] Roll android_tools to Android M SDK.

build/secondary/third_party/android_tools/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/android/rules.gni")
 
 config("cpu_features_include") {
   include_dirs = [ "ndk/sources/android/cpufeatures" ]
 }
 
@@ skipping 124 matching lines @@
     rebase_path("$target_gen_dir/checked_sdk_extras_version.stamp"),
   ]
   inputs = [
     "//build/android_sdk_extras.json",
     "$android_sdk_root/extras/google/google_play_services/source.properties",
   ]
   outputs = [
     "$target_gen_dir/checked_sdk_extras_version.stamp",
   ]
 }
+
+# TODO(jbudorick): Remove this once net_java_test_support no longer needs it.
+android_java_prebuilt("legacy_http_javalib") {
+  jar_path = "$android_sdk/optional/org.apache.http.legacy.jar"
+}