Make BrowsingDataHandler observe WebHistoryService deletions

components/history/core/browser/BUILD.gn

 # Copyright 2014 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.
 
 static_library("browser") {
   sources = [
     "delete_directive_handler.cc",
     "delete_directive_handler.h",
     "download_constants.h",
     "download_database.cc",
@@ skipping 64 matching lines @@
     "visit_database.cc",
     "visit_database.h",
     "visit_delegate.cc",
     "visit_delegate.h",
     "visit_tracker.cc",
     "visit_tracker.h",
     "visitsegment_database.cc",
     "visitsegment_database.h",
     "web_history_service.cc",
     "web_history_service.h",
+    "web_history_service_observer.h",
   ]
 
   public_deps = [
     "//skia",
   ]
 
   deps = [
     "//base",
     "//base:i18n",
     "//components/favicon_base",
@@ skipping 116 matching lines @@
     "//sql:test_support",
     "//testing/gtest",
     "//ui/gfx",
     "//ui/gfx:test_support",
     "//url",
   ]
   if (is_android) {
     sources += [ "android/android_history_types_unittest.cc" ]
   }
 }