[iOS] Clean deps and public_deps.

ios/chrome/browser/signin/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 source_set("signin") {
   sources = [
     "about_signin_internals_factory.cc",
     "about_signin_internals_factory.h",
     "account_consistency_service_factory.h",
     "account_consistency_service_factory.mm",
@@ skipping 30 matching lines @@
     "signin_client_impl.mm",
     "signin_error_controller_factory.cc",
     "signin_error_controller_factory.h",
     "signin_manager_factory.cc",
     "signin_manager_factory.h",
     "signin_manager_factory_observer.h",
     "signin_util.h",
     "signin_util.mm",
   ]
   deps = [
+    "//base",
     "//components/browser_sync",
-    "//components/sync",
-    "//ios/chrome/browser",
-    "//ios/chrome/browser/bookmarks:bookmarks_utils",
-    "//ios/chrome/browser/browser_state",
-    "//ios/chrome/browser/content_settings",
-    "//ios/chrome/browser/crash_report",
-    "//ios/chrome/browser/ui/commands",
-    "//ios/public/provider/chrome/browser/signin",
-    "//ios/web",
-    "//url",
-  ]
-  public_deps = [
-    "//base",
     "//components/content_settings/core/browser",
     "//components/keyed_service/core",
     "//components/keyed_service/ios",
     "//components/metrics",
     "//components/pref_registry",
     "//components/prefs",
     "//components/signin/core/browser",
     "//components/signin/ios/browser",
+    "//components/sync",
     "//google_apis",
+    "//ios/chrome/browser",
+    "//ios/chrome/browser/bookmarks:bookmarks_utils",
+    "//ios/chrome/browser/browser_state",
+    "//ios/chrome/browser/content_settings",
+    "//ios/chrome/browser/crash_report",
+    "//ios/chrome/browser/ui/commands",
     "//ios/chrome/common",
     "//ios/public/provider/chrome/browser",
+    "//ios/public/provider/chrome/browser/signin",
+    "//ios/web",
     "//net",
+    "//url",
   ]
 }
 
 source_set("test_support") {
   testonly = true
   sources = [
     "authentication_service_fake.h",
     "authentication_service_fake.mm",
     "fake_oauth2_token_service_builder.h",
     "fake_oauth2_token_service_builder.mm",
     "fake_signin_manager_builder.cc",
     "fake_signin_manager_builder.h",
   ]
   deps = [
+    ":signin",
+    "//base",
     "//components/signin/core/browser:test_support",
     "//components/signin/ios/browser",
     "//ios/chrome/browser/browser_state",
     "//ios/chrome/browser/sync",
+    "//ios/public/provider/chrome/browser",
     "//ios/public/provider/chrome/browser/signin",
   ]
-  public_deps = [
-    ":signin",
-    "//base",
-    "//ios/public/provider/chrome/browser",
-  ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "authentication_service_unittest.mm",
     "chrome_identity_service_observer_bridge_unittest.mm",
     "gaia_auth_fetcher_ios_unittest.mm",
   ]
   deps = [
@@ skipping 19 matching lines @@
     "//ios/public/provider/chrome/browser",
     "//ios/public/provider/chrome/browser/signin",
     "//ios/public/provider/chrome/browser/signin:test_support",
     "//ios/web:test_support",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/ocmock",
   ]
 }