Rename is_chromeos in chrome/src.

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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 298 matching lines @@
     }
   }
 
   if (is_linux) {  # TODO(GYP): || is_android || is_bsd?
     deps += [
       "//breakpad:core-2-minidump",
       "//breakpad:minidump-2-core",
     ]
   }
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     deps += [
       "//chromeos:chromeos_unittests",
       "//ui/chromeos:ui_chromeos_unittests",
     ]
   }
 
-  if (is_chromeos || is_mac || is_win) {
+  if (use_cros_fe || is_mac || is_win) {
     deps += [
       "//rlz:rlz_id",
       "//rlz:rlz_lib",
       "//rlz:rlz_unittests",
     ]
   }
 
   if (is_linux) {
     # The following are definitely linux-only.
     deps += [
       "//breakpad:breakpad_unittests",
       "//breakpad:generate_test_dump",
       "//dbus:dbus_test_server",
       "//dbus:dbus_unittests",
       "//net:disk_cache_memory_test",
       "//net:flip_in_mem_edsm_server",
       "//net:flip_in_mem_edsm_server_unittests",
       "//net:quic_client",
       "//net:quic_server",
       "//sandbox/linux:chrome_sandbox",
       "//sandbox/linux:sandbox_linux_unittests",
       "//sandbox/linux:sandbox_linux_jni_unittests",
     ]
 
-    if (is_chromeos || use_ash) {
+    if (use_cros_fe || use_ash) {
       deps += [ "//components/session_manager/core" ]
     }
   }
 
-  if (is_ios || is_win || (is_linux && !is_chromeos)) {
+  if (is_ios || is_win || (is_linux && !use_cros_fe)) {
     deps += [
       "//base:base_i18n_perftests",
       "//base:base_perftests",
     ]
   }
 
-  if (is_win || (is_linux && !is_chromeos)) {
+  if (is_win || (is_linux && !use_cros_fe)) {
     # TODO(GYP): Figure out which of these should (and can) build
     # for android/chromeos/mac/ios.
     deps += [
       "//base:check_example",
       "//base:build_utf8_validator_tables",
       "//cc:cc_perftests",
       "//cc/blink:cc_blink_unittests",
       "//chrome/test:load_library_perf_tests",
       "//chrome/test:performance_browser_tests",
       "//chrome/test:sync_performance_tests",
@@ skipping 61 matching lines @@
 
     if (use_aura) {
       deps += [
         "//ui/aura:aura_unittests",
         "//ui/aura:bench",
         "//ui/aura:demo",
       ]
     }
   }
 
-  if (is_linux && !is_chromeos) {
+  if (is_linux && !use_cros_fe) {
     deps += [
       # TODO(GYP): Figure out which of these should (and can) build
       # under which other conditions.
       "//build/sanitizers:copy_llvm_symbolizer",
       "//chrome/test:chrome_app_unittests",
       "//cloud_print:cloud_print_unittests",
       "//components/network_hints/browser",
       "//content/public/app:browser",
       "//content/public/app:child",
 
@@ skipping 147 matching lines @@
   deps = []
 
   if (!is_ios) {
     deps += [ "//mandoline:all" ]
   }
 
   if (!is_android && !is_ios) {
     deps += [ "//components/proximity_auth:proximity_auth_unittests" ]
   }
 
-  if (is_linux && !is_chromeos) {
+  if (is_linux && !use_cros_fe) {
     # TODO(GYP): Figure out if any of these should be in gn_all
     # and figure out how cross-platform they are
     deps += [
       ":gn_mojo_targets",
       "//chrome/browser/resources:extension_resource_demo",
       "//chrome/installer/util:strings",
       "//chrome:main_dll",
       "//chrome/test:load_library_perf_tests",
       "//chrome/tools/convert_dict",
       "//components/constrained_window:unit_tests",
@@ skipping 74 matching lines @@
     }
   }
 
   if (is_mac) {
     deps -= [ "//mandoline:all" ]  # TODO(GYP)
   }
 }
 
 group("gn_mojo_targets") {
   testonly = true
-  if (is_linux && !is_chromeos) {
+  if (is_linux && !use_cros_fe) {
     # TODO(GYP): Figure out if any of these should be in gn_all
     # and figure out how cross-platform they are
     deps = [
       "//chrome/browser/ui/webui/omnibox:mojo_bindings_python",
       "//content/public/common:mojo_bindings_python",
       "//content/common:mojo_bindings_python",
       "//content/test:web_ui_test_mojo_bindings_python",
       "//device/battery:mojo_bindings_python",
       "//device/vibration:mojo_bindings_python",
       "//ipc/mojo:ipc_mojo_perftests",
@@ skipping 211 matching lines @@
       "//ui/views:views_unittests",  # TooltipControllerTest failures
       "//ui/wm:wm_unittests",  # PASSES 4/21/2015
       "//url:url_unittests",  # PASSES 4/17/2015
 
       # TODO(GYP) nacl_integration
       # TODO(GYP) telemetry_perf_unittests
       # TODO(GYP) telemetry_unittests
     ]
   }
 }