Rename is_chromeos in chrome/src.

base/BUILD.gn

 # Copyright (c) 2013 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/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
@@ skipping 692 matching lines @@
     deps += [
       ":base_jni_headers",
       "//third_party/ashmem",
       "//third_party/android_tools:cpu_features",
     ]
 
     # logging.cc uses the Android logging library.
     libs = [ "log" ]
   }
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     sources -= [ "power_monitor/power_monitor_device_source_posix.cc" ]
   }
 
   if (is_nacl) {
     # We reset sources_assignment_filter in order to explicitly include
     # the linux file (which would otherwise be filtered out).
     set_sources_assignment_filter([])
     sources += [
       "files/file_path_watcher_stub.cc",
       "sync_socket_nacl.cc",
@@ skipping 289 matching lines @@
 
   if (!is_debug) {
     configs -= [ "//build/config/compiler:optimize" ]
     configs += [ "//build/config/compiler:optimize_max" ]
   }
 
   # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 }
 
-if (is_ios || is_win || (is_linux && !is_chromeos)) {
+if (is_ios || is_win || is_desktop_linux) {
   # TODO(GYP): Figure out which of these work and are needed on other platforms.
   test("base_perftests") {
     sources = [
       "message_loop/message_pump_perftest.cc",
 
       # "test/run_all_unittests.cc",
       "threading/thread_perftest.cc",
     ]
     deps = [
       ":base",
@@ skipping 616 matching lines @@
 
   # GYP: //base.gyp:base_java_unittest_support
   android_library("base_java_unittest_support") {
     deps = [
       ":base_java",
     ]
     java_files =
         [ "test/android/java/src/org/chromium/base/ContentUriTestUtils.java" ]
   }
 }