Split //ios/chrome/browser in multiple targets.

ios/chrome/browser/translate/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("translate") {
+  sources = [
+    "after_translate_infobar_controller.h",
+    "after_translate_infobar_controller.mm",
+    "before_translate_infobar_controller.h",
+    "before_translate_infobar_controller.mm",
+    "chrome_ios_translate_client.h",
+    "chrome_ios_translate_client.mm",
+    "never_translate_infobar_controller.h",
+    "never_translate_infobar_controller.mm",
+    "translate_accept_languages_factory.cc",
+    "translate_accept_languages_factory.h",
+    "translate_infobar_tags.h",
+    "translate_message_infobar_controller.h",
+    "translate_message_infobar_controller.mm",
+    "translate_service_ios.cc",
+    "translate_service_ios.h",
+  ]
+  deps = [
+    "//base",
+    "//components/infobars/core",
+    "//components/keyed_service/core",
+    "//components/keyed_service/ios",
+    "//components/prefs",
+    "//components/strings",
+    "//components/translate/core/browser",
+    "//components/translate/core/common",
+    "//components/translate/ios/browser",
+    "//components/web_resource",
+    "//ios/chrome/app/strings",
+    "//ios/chrome/app/theme",
+    "//ios/chrome/browser:browser_no_public_deps",
+    "//ios/chrome/browser/browser_state",
+    "//ios/chrome/browser/infobars",
+    "//ios/public/provider/chrome/browser",
+    "//ios/web",
+    "//ui/base",
+    "//ui/gfx",
+    "//url",
+  ]
+  allow_circular_includes_from = [ "//ios/chrome/browser/infobars" ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "translate_service_ios_unittest.cc",
+  ]
+  deps = [
+    ":translate",
+    "//ios/chrome/browser",
+    "//ios/public/provider/chrome/browser:test_support",
+    "//testing/gtest",
+    "//url",
+  ]
+}