Rename is_chromeos in chrome/src.

extensions/shell/BUILD.gn

Index: extensions/shell/BUILD.gn
diff --git a/extensions/shell/BUILD.gn b/extensions/shell/BUILD.gn
index 0c9927865c05091713b753fed10dbcf2db96f298..40acba8eb44c512c7ac8a1f3fc0ce900e883a7ef 100644
--- a/extensions/shell/BUILD.gn
+++ b/extensions/shell/BUILD.gn
@@ -76,7 +76,7 @@ source_set("app_shell_lib") {
     sources += aura_sources
   }
 
-  if (is_chromeos) {
+  if (is_chromeos_ui) {
     deps += [
       "//chromeos",
       "//ui/chromeos:ui_chromeos",
@@ -132,7 +132,7 @@ source_set("app_shell_lib") {
   }
 }
 
-if (!(is_chromeos && !use_ozone)) {
+if (!(is_chromeos_ui && !use_ozone)) {
   executable("app_shell") {
     # testonly because :app_shell_lib is testonly. See :app_shell_lib comment.
     testonly = true
@@ -203,7 +203,7 @@ test("app_shell_unittests") {
     sources += aura_sources
   }
 
-  if (is_chromeos) {
+  if (is_chromeos_ui) {
     deps += [ "//chromeos:test_support_without_gmock" ]
 
     chromeos_sources =