Get iOS GN build working again

ios/web/BUILD.gn

 # Copyright 2015 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.
 
 import("//testing/test.gni")
 import("//ios/web/js_compile.gni")
 
 source_set("web") {
   deps = [
     ":core",
@@ skipping 325 matching lines @@
     "public/test/js_test_util.h",
     "public/test/js_test_util.mm",
     "public/test/response_providers/data_response_provider.h",
     "public/test/response_providers/data_response_provider.mm",
     "public/test/response_providers/file_based_response_provider.h",
     "public/test/response_providers/file_based_response_provider.mm",
     "public/test/response_providers/file_based_response_provider_impl.h",
     "public/test/response_providers/file_based_response_provider_impl.mm",
     "public/test/response_providers/response_provider.h",
     "public/test/response_providers/response_provider.mm",
+    "public/test/scoped_Testing_web_client.h",

[sdefresne, 2016/02/22 08:29:29]

nit: the files are named scoped_testing_web_client.{h,mm} (i.e. with a
lower-case 't'). While bots and most of the devs use a case-insensitive file
system (this is the default on HFS+) other do use a case-sensitive one to work
on Chrome. Could you fix in a followup?

[Dirk Pranke, 2016/02/22 16:56:00]

Whoops. Yes of course, that must've been a typo that snuck in on my part :(.

+    "public/test/scoped_Testing_web_client.mm",
     "public/test/test_browser_state.cc",
     "public/test/test_browser_state.h",
     "public/test/test_web_client.h",
     "public/test/test_web_client.mm",
     "public/test/test_web_state.h",
     "public/test/test_web_state.mm",
     "public/test/test_web_thread.h",
     "public/test/test_web_thread_bundle.h",
     "public/test/test_web_view_content_view.h",
     "public/test/test_web_view_content_view.mm",
@@ skipping 129 matching lines @@
     ":web_bundle_ui",
     ":web_bundle_wk",
   ]
 
   sources = [
     "web_state/js/resources/plugin_placeholder.js",
     "web_state/js/resources/window_id.js",
     "webui/resources/web_ui.js",
   ]
 }