Implement MD simple gesture nav

chrome/app/vector_icons/BUILD.gn

 # 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.
 
 import("//ui/vector_icons/vector_icons.gni")
 
 aggregate_vector_icons("chrome_vector_icons") {
   icon_directory = "."
 
   icons = [
@@ skipping 11 matching lines @@
     "credit_card.icon",
     "folder.1x.icon",
     "folder.icon",
     "folder_managed.1x.icon",
     "folder_managed.icon",
     "folder_supervised.1x.icon",
     "folder_supervised.icon",
     "incognito.1x.icon",
     "incognito.icon",
     "laptop.icon",
-    "navigate_back.1x.icon",
-    "navigate_back.icon",
-    "navigate_forward.1x.icon",
-    "navigate_forward.icon",
     "navigate_home.1x.icon",
     "navigate_home.icon",
     "navigate_reload.1x.icon",
     "navigate_reload.icon",
     "navigate_stop.1x.icon",
     "navigate_stop.icon",
     "overflow_chevron.1x.icon",
     "overflow_chevron.icon",
     "smartphone.icon",
     "tab.icon",
@@ skipping 20 matching lines @@
 source_set("vector_icons") {
   sources = get_target_outputs(":chrome_vector_icons")
   sources += [ "//ui/gfx/vector_icon_types.h" ]
 
   deps = [
     ":chrome_vector_icons",
     "//base",
     "//skia",
   ]
 }