Move more vector icons into respective directories.

ash/resources/vector_icons/BUILD.gn

 # 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.
 
 action("aggregate_vector_icons") {
   visibility = [ ":*" ]
 
   script = "//ui/gfx/vector_icons/aggregate_vector_icons.py"
 
   icons = [
@@ skipping 53 matching lines @@
     "palette_mode_magnify.1x.icon",
     "palette_mode_magnify.icon",
     "palette_tray_icon_capture_region.1x.icon",
     "palette_tray_icon_capture_region.icon",
     "palette_tray_icon_default.1x.icon",
     "palette_tray_icon_default.icon",
     "palette_tray_icon_laser_pointer.1x.icon",
     "palette_tray_icon_laser_pointer.icon",
     "palette_tray_icon_magnify.1x.icon",
     "palette_tray_icon_magnify.icon",
+    "shelf_keyboard.1x.icon",
+    "shelf_keyboard.icon",
+    "shelf_logout.1x.icon",
+    "shelf_logout.icon",
     "shelf_notifications.1x.icon",
     "shelf_notifications.icon",
+    "shelf_overflow.1x.icon",
+    "shelf_overflow.icon",
+    "shelf_overview.1x.icon",
+    "shelf_overview.icon",
     "system_menu_accessibility.1x.icon",
     "system_menu_accessibility.icon",
     "system_menu_accessibility_auto_click.1x.icon",
     "system_menu_accessibility_auto_click.icon",
     "system_menu_accessibility_chromevox.1x.icon",
     "system_menu_accessibility_chromevox.icon",
     "system_menu_accessibility_contrast.1x.icon",
     "system_menu_accessibility_contrast.icon",
     "system_menu_accessibility_large_cursor.1x.icon",
     "system_menu_accessibility_large_cursor.icon",
@@ skipping 140 matching lines @@
 source_set("vector_icons") {
   sources = get_target_outputs(":aggregate_vector_icons")
   sources += [ "//ui/gfx/vector_icon_types.h" ]
 
   deps = [
     ":aggregate_vector_icons",
     "//base",
     "//skia",
   ]
 }