Remove unused target.

BUG=None

Review-Url: https://codereview.chromium.org/2571833002
Cr-Commit-Position: refs/heads/master@{#438218}

ios/chrome/today_extension/BUILD.gn

@@ -5,12 +5,6 @@
 import("//build/config/locales.gni")
 import("//ios/chrome/extension_repack.gni")
 
-group("resources") {
-  deps = [
-    "//ios/chrome/today_extension/strings",
-  ]
-}
-
 extension_repack_all_locales("packed_resources") {
   extension = "today_extension"
   input_locales = ios_packed_locales