GN: Avoid failing unconditionally on iOS due to the lack of a target for icudata

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index b80d1530f871a63d3ceb7cd1365c2db1428c5485..c9a3b49fec99487331ef387ad2940617b874e797 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -503,12 +503,11 @@ component("icuuc") {
 # TODO(GYP) support use_system_icu.
 if (icu_use_data_file) {
   if (is_ios) {
-    # TODO(GYP): Support mac resource bundle shown below.
-    # 'link_settings': {
-    #   'mac_bundle_resources': [
-    #     'source/data/in/icudtl.dat',
-    #   ],
-    # }
+    group("icudata") {
+      # TODO(csg): Provide an empty group so that this target does not
+      # unconditionally fail. The dat file needs to be bundled separately. In
+      # the longer term, need to figure out how to use system ICU
+    }

[Dirk Pranke, 2015/06/16 00:46:41]

Please leave this as TODO(GYP): so that we can track all of the
transition-related things more easily. If you want to also have TODO(csg), feel
free to list both.

   } else {
     copy("icudata") {
       if (is_android) {