Copied  issue chromium:884719  from  issue chromium:884718 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ae617d374b24f2de52bdf661cf5a0ca6e16312ea

commit ae617d374b24f2de52bdf661cf5a0ca6e16312ea
Author: Mark Cogan <marq@google.com>
Date: Mon Oct 01 11:06:05 2018

[iOS] Clean up legacy bookmarks UI

This Cl removes usgae of IsBookmarksUIRebootEnabled(), refactors code
around it, removes unused images, and removes unused classes.

Bug:  884719 
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I12bf030f91f3510418b9d53666d1a387e8b937fe
Reviewed-on: https://chromium-review.googlesource.com/1250926
Commit-Queue: Mark Cogan <marq@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595423}
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/BUILD.gn
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/bookmark_edit_view_controller.mm
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/bookmark_empty_background.mm
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/bookmark_folder_editor_view_controller.mm
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/bookmark_folder_view_controller.mm
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/bookmark_home_shared_state.mm
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/bookmark_home_view_controller.mm
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/bookmark_interaction_controller.mm
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/bookmark_navigation_controller.mm
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/bookmarks_egtest.mm
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/cells/BUILD.gn
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/cells/bookmark_folder_item.mm
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/cells/bookmark_home_node_item.mm
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/cells/bookmark_home_promo_item.mm
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/cells/bookmark_parent_folder_item.mm
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/cells/bookmark_table_cell.h
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/cells/bookmark_table_cell.mm
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/cells/bookmark_text_field_item.h
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/cells/bookmark_text_field_item.mm
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/bookmarks/resources/BUILD.gn
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_bar_innershadow.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_black_delete.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_black_edit.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_black_move.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_black_select.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_gray_back.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_gray_check.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_gray_close.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_gray_edit.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_gray_folder.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_gray_folder_new.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_gray_menu.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_gray_new_folder.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_gray_star_large.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_more.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_white_close.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_white_delete.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_white_edit.imageset/Contents.json
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/bookmarks/resources/bookmark_white_move.imageset/Contents.json
[modify] https://crrev.com/ae617d374b24f2de52bdf661cf5a0ca6e16312ea/ios/chrome/browser/ui/util/BUILD.gn
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/util/form_sheet_navigation_controller.h
[delete] https://crrev.com/4ac1bca28661d78c10613a5f098bb2510426a474/ios/chrome/browser/ui/util/form_sheet_navigation_controller.mm