Revert of [ios] Move WebStateList to ios/chrome/browser/web_state_list.

ios/chrome/browser/web_state_list/BUILD.gn

Index: ios/chrome/browser/web_state_list/BUILD.gn
diff --git a/ios/chrome/browser/web_state_list/BUILD.gn b/ios/chrome/browser/web_state_list/BUILD.gn
deleted file mode 100644
index dde15ae59678911efac9b7c2177458108845bc93..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/web_state_list/BUILD.gn
+++ /dev/null
@@ -1,68 +0,0 @@
-# Copyright 2017 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("web_state_list") {
-  sources = [
-    "web_state_list.h",
-    "web_state_list.mm",
-    "web_state_list_delegate.h",
-    "web_state_list_fast_enumeration_helper.h",
-    "web_state_list_fast_enumeration_helper.mm",
-    "web_state_list_metrics_observer.h",
-    "web_state_list_metrics_observer.mm",
-    "web_state_list_observer.h",
-    "web_state_list_observer.mm",
-    "web_state_list_observer_bridge.h",
-    "web_state_list_observer_bridge.mm",
-    "web_state_list_order_controller.h",
-    "web_state_list_order_controller.mm",
-    "web_state_list_serialization.h",
-    "web_state_list_serialization.mm",
-    "web_state_opener.h",
-    "web_state_opener.mm",
-  ]
-  deps = [
-    "//base",
-    "//ios/web",
-    "//ui/base",
-  ]
-  libs = [ "Foundation.framework" ]
-  configs += [ "//build/config/compiler:enable_arc" ]
-}
-
-source_set("test_support") {
-  testonly = true
-  sources = [
-    "fake_web_state_list_delegate.h",
-    "fake_web_state_list_delegate.mm",
-  ]
-  deps = [
-    ":web_state_list",
-    "//base",
-  ]
-  configs += [ "//build/config/compiler:enable_arc" ]
-}
-
-source_set("unit_tests") {
-  testonly = true
-  sources = [
-    "web_state_list_fast_enumeration_helper_unittest.mm",
-    "web_state_list_order_controller_unittest.mm",
-    "web_state_list_serialization_unittest.mm",
-    "web_state_list_unittest.mm",
-    "web_state_opener_unittest.mm",
-  ]
-  deps = [
-    ":test_support",
-    ":web_state_list",
-    "//base",
-    "//ios/web",
-    "//ios/web:test_support",
-    "//net",
-    "//testing/gtest",
-    "//ui/base",
-    "//url",
-  ]
-  configs += [ "//build/config/compiler:enable_arc" ]
-}