Path evaluation to protobuf plugin.

components/tracing/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("//third_party/protobuf/proto_library.gni")
 
 component("tracing") {
   sources = [
     "child/child_memory_dump_manager_delegate_impl.cc",
     "child/child_memory_dump_manager_delegate_impl.h",
@@ skipping 52 matching lines @@
   visibility = [ "//components/tracing/*" ]
 
   sources = [
     "test/example_messages.proto",
   ]
 
   generator_plugin_label = "tools/proto_zero_plugin:proto_zero_plugin"
   generator_plugin_suffix = ".pbzero"
   generate_cc = false
   generate_python = false
-
-  # TODO(kraynov) Move away this complex path evaluation and dependency
-  # injection to proto_library.gni. All lines below should be removed.
-  # The problem is that root_out_dir and root_build_dir may differ in case of
-  # cross compilation. Also .exe will be appended on Windows.
-
-  plugin_host_label = generator_plugin_label + "($host_toolchain)"
-  generator_plugin =
-      rebase_path(get_label_info(plugin_host_label, "root_out_dir") + "/" +
-                      get_label_info(plugin_host_label, "name"),
-                  root_build_dir)
-  if (is_win) {
-    generator_plugin += ".exe"
-  }
-
-  deps = [
-    plugin_host_label,
-  ]
 }
 
 source_set("unit_tests") {
   testonly = true
 
   sources = [
     "child/child_trace_message_filter_unittest.cc",
     "common/graphics_memory_dump_provider_android_unittest.cc",
     "common/process_metrics_memory_dump_provider_unittest.cc",
     "core/proto_utils_unittest.cc",
@@ skipping 11 matching lines @@
     "//ipc",
     "//testing/gmock:gmock",
     "//testing/gtest",
   ]
 
   if (!is_android) {
     sources += [ "browser/trace_config_file_unittest.cc" ]
     deps += [ ":startup_tracing" ]
   }
 }