Add missing dependency on packed resources to ios_chrome_unittests.

ios/chrome/BUILD.gn

Index: ios/chrome/BUILD.gn
diff --git a/ios/chrome/BUILD.gn b/ios/chrome/BUILD.gn
index 9dde720bdd8f8ce6c50d8e5cf2ef7e84b2f7dfcc..e57b79046ab77d88b138eb68e45160fdc92ae334 100644
--- a/ios/chrome/BUILD.gn
+++ b/ios/chrome/BUILD.gn
@@ -10,6 +10,13 @@ test("ios_chrome_unittests") {
     # Ensure that all unit tests are run.
     "//ios/chrome/test:run_all_unittests",
 
+    # Ensure that packed resources are available (it should be a dependency
+    # of //ios/chrome/app however, Chrome on iOS uses different resources,
+    # so the dependency cannot be added there).
+    # TODO(crbug.com/653086): find a way to fix those dependency as part of
+    # building Chromium for iOS, and then remove the dependency.
+    "//ios/chrome/app/resources:packed_resources",
+
     # Add unit_tests target here.
     "//ios/chrome/app:unit_tests",
     "//ios/chrome/app/application_delegate:unit_tests",