Rename is_chromeos in chrome/src.

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 3136887e63f9115f98662ba5bde7fe3d6fc2e142..693d7a9797037ae7689f9f5cc67aa3e1f566882f 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -347,7 +347,7 @@ source_set("browser") {
   if (!is_win && !is_mac && !is_ios) {
     sources += [ "net/net_error_diagnostics_dialog_generic.cc" ]
   }
-  if (!is_android && !is_ios && !is_chromeos && enable_configuration_policy) {
+  if (!is_android && !is_ios && !use_cros_fe && enable_configuration_policy) {
     sources += [
       "net/disk_cache_dir_policy_handler.cc",
       "net/disk_cache_dir_policy_handler.h",
@@ -387,7 +387,7 @@ source_set("browser") {
     sources += rebase_path(gypi_values.chrome_browser_background_sources,
                            ".",
                            "//chrome")
-    if (!use_aura || is_win || is_chromeos) {
+    if (!use_aura || is_win || use_cros_fe) {
       sources -= [ "background/background_mode_manager_aura.cc" ]
     }
   }
@@ -424,7 +424,7 @@ source_set("browser") {
                              ".",
                              "//chrome")
     }
-    if (!is_chromeos) {
+    if (!use_cros_fe) {
       sources += rebase_path(
               gypi_values.chrome_browser_policy_shared_with_ios_not_chromeos_sources,
               ".",
@@ -495,11 +495,11 @@ source_set("browser") {
       "//device/udev_linux",
     ]
   }
-  if (is_linux && !is_chromeos) {
+  if (is_linux && !use_cros_fe) {
     deps += [ "//third_party/speech-dispatcher" ]
   }
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     sources += rebase_path(gypi_values.chrome_browser_chromeos_sources,
                            ".",
                            "//chrome")
@@ -518,7 +518,7 @@ source_set("browser") {
     ]
   }
 
-  if (is_chromeos || is_ios) {
+  if (use_cros_fe || is_ios) {
     sources -= [
       "metrics/signin_status_metrics_provider.cc",
       "metrics/signin_status_metrics_provider.h",
@@ -577,7 +577,7 @@ source_set("browser") {
   if (use_nss_certs) {
     sources +=
         rebase_path(gypi_values.chrome_browser_nss_sources, ".", "//chrome")
-    if (is_chromeos) {
+    if (use_cros_fe) {
       sources -= [ "net/nss_context_linux.cc" ]
     }
   }
@@ -636,7 +636,7 @@ source_set("browser") {
                            "//chrome")
   }
 
-  if (!is_android && !is_ios && !is_chromeos) {
+  if (!is_android && !is_ios && !use_cros_fe) {
     sources +=
         rebase_path(gypi_values.chrome_browser_desktop_sources, ".", "//chrome")
   }
@@ -1100,7 +1100,7 @@ source_set("test_support") {
     deps += [ "//extensions:test_support" ]
   }
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     sources += [
       "chromeos/app_mode/fake_cws.cc",
       "chromeos/app_mode/fake_cws.h",