fixup! Fixed gn check error

Author: AlexeyBarabash

extensions/BUILD.gn

@@ -8,7 +8,8 @@ import("//extensions/buildflags/buildflags.gni")
 if (is_android || is_ios) {
   source_set("common") {
     sources = [
-      # "//extensions/common/constants.cc",
+      "//extensions/common/constants.cc",
+
       # "//extensions/common/constants.h", this triggers gn check errors in upstream
       "//extensions/common/error_utils.cc",
       "//extensions/common/error_utils.h",
@@ -20,6 +21,7 @@ if (is_android || is_ios) {
 
     deps = [
       "//base",
+      "//build:chromeos_buildflags",
       "//components/url_pattern_index",
       "//device/vr/buildflags",
       "//extensions/buildflags",