make NavigationGesture part of public content API and use it outside content

content/common/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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//ppapi/features/features.gni")
 import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
@@ skipping 200 matching lines @@
     "media/media_player_messages_android.h",
     "media/media_stream_messages.h",
     "media/media_stream_options.cc",
     "media/media_stream_options.h",
     "media/media_stream_track_metrics_host_messages.h",
     "media/midi_messages.h",
     "media/surface_view_manager_messages_android.h",
     "media/video_capture.h",
     "memory_messages.h",
     "message_port_messages.h",
-    "navigation_gesture.h",
     "navigation_params.cc",
     "navigation_params.h",
     "net/url_fetcher.cc",
     "net/url_request_service_worker_data.cc",
     "net/url_request_service_worker_data.h",
     "net/url_request_user_data.cc",
     "net/url_request_user_data.h",
     "origin_trials/trial_token.cc",
     "origin_trials/trial_token.h",
     "origin_trials/trial_token_validator.cc",
@@ skipping 374 matching lines @@
     "//ui/gfx/geometry/mojo",
     "//ui/gfx/mojo",
     "//url/mojo:url_mojom_gurl",
     "//url/mojo:url_mojom_origin",
   ]
 
   export_class_attribute = "CONTENT_EXPORT"
   export_define = "CONTENT_IMPLEMENTATION=1"
   export_header = "content/common/content_export.h"
 }