Rename is_chromeos in chrome/src.

chrome/common/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("//tools/grit/grit_rule.gni")
 import("//third_party/mojo/src/mojo/public/tools/bindings/mojom.gni")
 import("//chrome/version.gni")
 
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("../chrome_common.gypi") ],
@@ skipping 107 matching lines @@
                            "//chrome")
     deps += [
       "//device/usb",
       "//chrome/common/extensions/api",
       "//extensions/common",
       "//extensions/common/api",
       "//extensions:extensions_resources",
       "//extensions/strings",
       "//media/cast:net",
     ]
-    if (is_chromeos) {
+    if (use_cros_fe) {
       sources +=
           rebase_path(gypi_values.chrome_common_extensions_chromeos_sources,
                       ".",
                       "//chrome")
     }
   }
 
   if (is_win || is_mac) {
     sources +=
         rebase_path(gypi_values.chrome_common_win_mac_sources, ".", "//chrome")
     deps += [ "//breakpad:client" ]
   }
-  if (is_win || is_mac || is_chromeos) {
+  if (is_win || is_mac || use_cros_fe) {
     if (use_openssl) {
       sources += rebase_path(
               gypi_values.chrome_common_networking_private_sources_openssl,
               ".",
               "//chrome")
 
       # networking_private_crypto_openssl.cc depends on boringssl.
       deps += [ "//third_party/boringssl" ]
     } else {
       sources +=
@@ skipping 45 matching lines @@
       "channel_info_posix.cc",
       "icon_with_badge_image_source.cc",
       "media_galleries/metadata_types.h",
     ]
   } else {
     # Non-Android.
     sources +=
         rebase_path(gypi_values.chrome_common_importer_sources, ".", "//chrome")
   }
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     sources -= [ "channel_info_posix.cc" ]
   }
 
   if (is_win) {
     deps += [
       "//components/dom_distiller/core",  # Needed by chrome_content_client.cc.
       "//third_party/wtl",
     ]
   }
 
@@ skipping 134 matching lines @@
     ":constants",
     "//base",
   ]
 }
 
 mojom("mojo_bindings") {
   sources = [
     "resource_usage_reporter.mojom",
   ]
 }