gn: Stop setting secondary_source.

Downstream projects that used android_tools need to switch to android_sdk,
see https://webrtc.googlesource.com/src.git/+/c90e81e2d9592584c5f27074e0b5c33ebad75a5f
for an example.

Bug: 947060
Change-Id: I982960d4bde88e2d780b71b019ec0aaba1019af3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1546876
Auto-Submit: Nico Weber <thakis@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#646475}

.gn

@@ -8,11 +8,6 @@ import("//third_party/angle/dotfile_settings.gni")
 # The location of the build configuration file.
 buildconfig = "//build/config/BUILDCONFIG.gn"
 
-# The secondary source root is a parallel directory tree where
-# GN build files are placed when they can not be placed directly
-# in the source tree, e.g. for third party source trees.
-secondary_source = "//build/secondary/"
-
 # These arguments override the default values for items in a declare_args
 # block. "gn args" in turn can override these.
 #

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")
-
-# TODO(crbug.com/947060): All targets in this file are temporary aliases. They
-# will be removed once all downstream targets are switched over to using
-# //third_party/android_sdk.
-
-group("cpu_features") {
-  public_deps = [
-    "//third_party/android_sdk:cpu_features",
-  ]
-}
-
-if (enable_java_templates) {
-  java_group("android_test_base_java") {
-    testonly = true
-    deps = [
-      "//third_party/android_sdk:android_test_base_java",
-    ]
-  }
-  java_group("android_test_mock_java") {
-    testonly = true
-    deps = [
-      "//third_party/android_sdk:android_test_mock_java",
-    ]
-  }
-  java_group("android_test_runner_java") {
-    testonly = true
-    deps = [
-      "//third_party/android_sdk:android_test_runner_java",
-    ]
-  }
-}