Use framework style includes in ios/web_view/public.

ios/web_view/public/BUILD.gn

Index: ios/web_view/public/BUILD.gn
diff --git a/ios/web_view/public/BUILD.gn b/ios/web_view/public/BUILD.gn
deleted file mode 100644
index 203536aa4f487090269b7062485cb01dbfcc93aa..0000000000000000000000000000000000000000
--- a/ios/web_view/public/BUILD.gn
+++ /dev/null
@@ -1,28 +0,0 @@
-# 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("public") {
-  visibility = [
-    "//ios/web_view:*",
-    "//ios/web_view/internal/*",
-  ]
-
-  sources = [
-    "cwv.h",
-    "cwv_delegate.h",
-    "cwv_export.h",
-    "cwv_html_element.h",
-    "cwv_navigation_action.h",
-    "cwv_navigation_delegate.h",
-    "cwv_translate_delegate.h",
-    "cwv_translate_manager.h",
-    "cwv_ui_delegate.h",
-    "cwv_user_content_controller.h",
-    "cwv_user_script.h",
-    "cwv_web_view.h",
-    "cwv_web_view_configuration.h",
-  ]
-
-  libs = [ "UIKit.framework" ]
-}