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 8b3ab7afb6430940a862c39fa1554cd08621a7b0..494dced5162eb923614e0c6056d2c10fe2c7de45 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) {
@@ -737,7 +738,6 @@ 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",
     ]
@@ -750,7 +750,6 @@ if (is_win) {
       ":packed_extra_resources",
       ":packed_resources",
       "//chrome/app_shim:app_mode_loader",
-      "//third_party/icu:icudata",
     ]
 
     if (enable_hidpi) {
@@ -774,6 +773,11 @@ if (is_win) {
       ]
     }
 
+    if (icu_use_data_file) {
+      sources += [ "$root_out_dir/icudtl.dat" ]
+      public_deps += [ "//third_party/icu:icudata" ]
+    }
+
     if (v8_use_external_startup_data) {
       sources += [
         "$root_out_dir/natives_blob.bin",