Upgrade to new Android SDK.

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 17 matching lines @@
     default_android_ndk_root = "//third_party/android_tools/ndk"
     default_android_ndk_version = "r12b"
     default_android_ndk_major_version = "12"
   } else {
     assert(defined(default_android_ndk_version))
     assert(defined(default_android_ndk_major_version))
   }
 
   if (!defined(default_android_sdk_root)) {
     default_android_sdk_root = "//third_party/android_tools/sdk"
-    default_android_sdk_version = "23"
-    default_android_sdk_build_tools_version = "23.0.1"
+    default_android_sdk_version = "24"
+    default_android_sdk_build_tools_version = "24.0.2"
   }
 
   if (!defined(default_lint_android_sdk_root)) {
     # Purposefully repeated so that downstream can change
     # default_android_sdk_root without changing lint version.
     default_lint_android_sdk_root = "//third_party/android_tools/sdk"
     default_lint_android_sdk_version = "23"
   }
 
   if (!defined(default_android_keystore_path)) {
@@ skipping 283 matching lines @@
           "//build/toolchain/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
 }