[ios] Move ToolsMenuConfiguration to shared.

ios/shared/chrome/browser/ui/tools_menu/BUILD.gn

Index: ios/shared/chrome/browser/ui/tools_menu/BUILD.gn
diff --git a/ios/shared/chrome/browser/ui/tools_menu/BUILD.gn b/ios/shared/chrome/browser/ui/tools_menu/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..eb5a01d6c3a5deb78a6a63067856118edeb76c25
--- /dev/null
+++ b/ios/shared/chrome/browser/ui/tools_menu/BUILD.gn
@@ -0,0 +1,17 @@
+# 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("tools_menu") {
+  sources = [
+    "tools_menu_configuration.h",
+    "tools_menu_configuration.mm",
+  ]
+
+  configs += [ "//build/config/compiler:enable_arc" ]
+
+  deps = [
+    "//base",
+    "//ios/web:user_agent",
+  ]
+}