Fix GN build on mac with icu_use_data_file = false

chrome/BUILD.gn

Index: chrome/BUILD.gn
diff --git a/chrome/BUILD.gn b/chrome/BUILD.gn
index ee1ff08716937489da3b345289c23bbecd25ab1d..5de11972346fd304265b161363a75394bacf94c7 100644
--- a/chrome/BUILD.gn
+++ b/chrome/BUILD.gn
@@ -28,6 +28,7 @@ if (is_android) {
   import("//build/util/version.gni")
   import("//build_overrides/v8.gni")
   import("//media/cdm/ppapi/cdm_paths.gni")
+  import("//third_party/icu/config.gni")
 }
 
 if (is_win) {
@@ -721,10 +722,12 @@ if (is_win) {
       "$root_gen_dir/repack/resources.pak",
       "$root_out_dir/app_mode_loader.app",
       "$root_out_dir/chrome_100_percent.pak",
-      "$root_out_dir/icudtl.dat",
       "app/theme/default_100_percent/$branding_path_component/product_logo_32.png",
       "browser/mac/install.sh",
     ]
+    if (icu_use_data_file) {
+      sources += [ "$root_out_dir/icudtl.dat" ]
+    }
 
     outputs = [
       "{{bundle_resources_dir}}/{{source_file_part}}",