Removed unused web_capabilities.* files.

Bug: 878755
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I00f53e806094ecda6449def21b12b54fe386fc47
Reviewed-on: https://chromium-review.googlesource.com/1212271Reviewed-by: Peter Lee <pkl@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589592}

ios/web/public/BUILD.gn

@@ -60,8 +60,6 @@ source_set("public") {
     "url_schemes.h",
     "url_schemes.mm",
     "url_util.h",
-    "web_capabilities.cc",
-    "web_capabilities.h",
     "web_client.h",
     "web_kit_constants.h",
     "web_state/context_menu_params.h",

ios/web/public/web_capabilities.cc

-// 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.
-
-#include "ios/web/public/web_capabilities.h"
-
-namespace web {
-
-bool IsAutoDetectEncodingSupported() {
-  // TODO(crbug.com/600765): WKWebView does not provide API for auto-detection
-  // of the page encoding. Revisit this issue with the next major of iOS.
-  return false;
-}
-
-bool IsDoNotTrackSupported() {
-  // TODO(crbug.com/493368): WKWebView does not provide API for adding DNT
-  // headers on iOS9. Revisit this issue with the next major release of iOS.
-  return false;
-}
-
-}  // namespace web

ios/web/public/web_capabilities.h

-// 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.
-
-#ifndef IOS_WEB_PUBLIC_WEB_CAPABILITIES_H_
-#define IOS_WEB_PUBLIC_WEB_CAPABILITIES_H_
-
-namespace web {
-
-// Returns true if auto-detection of page encoding is supported by //web.
-bool IsAutoDetectEncodingSupported();
-
-// Returns true if "Do-Not-Track" is supported by //web API.
-bool IsDoNotTrackSupported();
-
-}  // namespace web
-
-#endif  // IOS_WEB_PUBLIC_WEB_CAPABILITIES_H_