Remove some unused history resources on iOS

ios/chrome/browser/ui/webui/history/BUILD.gn

Index: ios/chrome/browser/ui/webui/history/BUILD.gn
diff --git a/ios/chrome/browser/ui/webui/history/BUILD.gn b/ios/chrome/browser/ui/webui/history/BUILD.gn
deleted file mode 100644
index a687d9f0bf1d43b8e1086b3ec0c85935f14470aa..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/ui/webui/history/BUILD.gn
+++ /dev/null
@@ -1,51 +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("history") {
-  sources = [
-    "browsing_history_handler.cc",
-    "browsing_history_handler.h",
-    "favicon_source.cc",
-    "favicon_source.h",
-    "history_ui.h",
-    "history_ui.mm",
-    "metrics_handler.cc",
-    "metrics_handler.h",
-  ]
-  deps = [
-    "//base",
-    "//base:i18n",
-    "//components/bookmarks/browser",
-    "//components/browser_sync",
-    "//components/browsing_data/core",
-    "//components/favicon/core",
-    "//components/favicon_base",
-    "//components/history/core/browser",
-    "//components/keyed_service/core",
-    "//components/prefs",
-    "//components/resources",
-    "//components/search",
-    "//components/signin/core/browser",
-    "//components/strings",
-    "//components/sync",
-    "//components/sync_sessions",
-    "//components/url_formatter",
-    "//ios/chrome/app/resources",
-    "//ios/chrome/browser",
-    "//ios/chrome/browser/bookmarks",
-    "//ios/chrome/browser/browser_state",
-    "//ios/chrome/browser/favicon",
-    "//ios/chrome/browser/history",
-    "//ios/chrome/browser/signin",
-    "//ios/chrome/browser/signin",
-    "//ios/chrome/browser/sync",
-    "//ios/chrome/browser/ui",
-    "//ios/web",
-    "//net",
-    "//ui/base",
-    "//ui/gfx",
-    "//ui/resources",
-    "//url",
-  ]
-}