Remove CWVDelegate.

ios/web_view/shell/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.
 
 import("//build/config/ios/rules.gni")
 
 ios_app_bundle("ios_web_view_shell") {
   info_plist = "Info.plist"
 
   deps = [
     ":shell",
   ]
   bundle_deps = [ "//ios/web_view:web_view+bundle" ]
 
   configs += [ "//build/config/compiler:enable_arc" ]
 }
 
 source_set("shell") {
   sources = [
     "shell_app_delegate.h",
     "shell_app_delegate.m",
-    "shell_delegate.h",
-    "shell_delegate.m",
     "shell_exe_main.m",
     "shell_view_controller.h",
     "shell_view_controller.m",
     "translate_controller.h",
     "translate_controller.m",
   ]
 
   deps = [
     ":resources",
     "//ios/web_view:web_view+link",
@@ skipping 23 matching lines @@
     "Default-568h@2x.png",
     "textfield_background@2x.png",
     "toolbar_back@2x.png",
     "toolbar_forward@2x.png",
     "toolbar_stop@2x.png",
   ]
   outputs = [
     "{{bundle_resources_dir}}/{{source_file_part}}",
   ]
 }