Rename is_chromeos in chrome/src.

ash/BUILD.gn

Index: ash/BUILD.gn
diff --git a/ash/BUILD.gn b/ash/BUILD.gn
index 2f53cce59f79107a5523f632b0c4c86ceb9e3a89..9084e047321300bba7465572ceffe80afad6ad3e 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -92,7 +92,7 @@ component("ash") {
     ]
   }
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     deps += [
       "//device/bluetooth",
       "//ui/display",
@@ -315,7 +315,7 @@ test("ash_unittests") {
     "//url",
   ]
 
-  if (!is_chromeos) {
+  if (!use_cros_fe) {
     sources -= [
       # TODO(zork): fix this test to build on Windows. See: crosbug.com/26906
       "focus_cycler_unittest.cc",
@@ -344,7 +344,7 @@ test("ash_unittests") {
   if (!use_x11) {
     sources -= [ "host/ash_window_tree_host_x11_unittest.cc" ]
   }
-  if (is_chromeos) {
+  if (use_cros_fe) {
     sources += [ "first_run/first_run_helper_unittest.cc" ]
     deps += [
       "//device/bluetooth",
@@ -363,7 +363,7 @@ test("ash_unittests") {
     ]
   }
 
-  if (!use_x11 || !is_chromeos) {
+  if (!use_x11 || !use_cros_fe) {
     sources -= [ "touch/touch_transformer_controller_unittest.cc" ]
   }
 
@@ -371,7 +371,7 @@ test("ash_unittests") {
   #['OS=="linux" and component=="shared_library" and use_allocator!="none"', {
   # ldflags = "-rdynamic"
 
-  if (!is_chromeos) {
+  if (!use_cros_fe) {
     sources -= [ "sticky_keys/sticky_keys_unittest.cc" ]
   }
 }
@@ -393,7 +393,7 @@ executable("ash_shell") {
     deps += [ "//sandbox" ]
   }
 
-  if (is_chromeos) {
+  if (use_cros_fe) {
     deps += [ "//device/bluetooth" ]
   }
 }