Remove unused blink::WebTouchInfo

Bug: 919392
Change-Id: I3a90a95ebb307d812ac7cd80348853d061b74302
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1886681Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com>
Cr-Commit-Position: refs/heads/master@{#710728}

build/check_gn_headers_whitelist.txt

@@ -247,7 +247,6 @@ third_party/blink/renderer/platform/text/TabSize.h
 third_party/blink/renderer/platform/text/TextDirection.h
 third_party/blink/renderer/platform/transforms/TransformOperation.h
 third_party/blink/public/platform/WebSourceLocation.h
-third_party/blink/public/platform/WebTouchInfo.h
 third_party/blink/public/platform/modules/media_capabilities/WebMediaCapabilitiesInfo.h
 third_party/cacheinvalidation/src/google/cacheinvalidation/impl/build_constants.h
 third_party/expat/files/lib/ascii.h

third_party/blink/public/platform/web_touch_info.h

-// 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.
-
-#ifndef THIRD_PARTY_BLINK_PUBLIC_PLATFORM_WEB_TOUCH_INFO_H_
-#define THIRD_PARTY_BLINK_PUBLIC_PLATFORM_WEB_TOUCH_INFO_H_
-
-#include "third_party/blink/public/platform/web_rect.h"
-#include "third_party/blink/public/platform/web_touch_action.h"
-
-namespace blink {
-
-struct WebTouchInfo {
-  WebRect rect;
-  WebTouchAction touch_action;
-};
-
-}  // namespace blink
-
-#endif