Remove the enable_task_manager build flag and define.

chrome/common/extensions/api/BUILD.gn

 # Copyright 2015 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/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
 import("//extensions/features/features.gni")
 import("//media/media_options.gni")
 import("//tools/json_schema_compiler/json_features.gni")
@@ skipping 69 matching lines @@
 
   # Despite the name, these APIs do not rely on any WebRTC-specific bits and as
   # such do not belong in a conditional.
   "webrtc_audio_private.idl",
   "webrtc_desktop_capture_private.idl",
   "webrtc_logging_private.idl",
   "webstore_private.json",
   "webstore_widget_private.idl",
   "windows.json",
 ]
-if (enable_task_manager) {
+if (!is_android) {
   schema_sources += [ "processes.idl" ]
 }
 if (is_chromeos) {
   schema_sources += [
     "certificate_provider.idl",
     "certificate_provider_internal.idl",
     "echo_private.json",
     "enterprise_device_attributes.idl",
     "enterprise_platform_keys.idl",
     "enterprise_platform_keys_internal.idl",
@@ skipping 166 matching lines @@
 }
 
 group("extensions_features") {
   public_deps = [
     ":api_features",
     ":behavior_features",
     ":manifest_features",
     ":permission_features",
   ]
 }