The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/62ff72d4604ce4bb6f7f612d8ca02436e098695e

commit 62ff72d4604ce4bb6f7f612d8ca02436e098695e
Author: estade <estade@chromium.org>
Date: Wed Feb 08 02:52:51 2017

Remove TrayPopupLabelButton (a pre-MD class) and its assets.

This also tears out some pre-MD code from other files, but I tried to
limit that to the minimum required to remove this button class.

BUG= 686261 , 686251 

Review-Url: https://codereview.chromium.org/2686703002
Cr-Commit-Position: refs/heads/master@{#448876}

[modify] https://crrev.com/62ff72d4604ce4bb6f7f612d8ca02436e098695e/ash/BUILD.gn
[modify] https://crrev.com/62ff72d4604ce4bb6f7f612d8ca02436e098695e/ash/common/system/chromeos/network/network_state_list_detailed_view.cc
[modify] https://crrev.com/62ff72d4604ce4bb6f7f612d8ca02436e098695e/ash/common/system/chromeos/network/network_state_list_detailed_view.h
[modify] https://crrev.com/62ff72d4604ce4bb6f7f612d8ca02436e098695e/ash/common/system/chromeos/network/tray_vpn.cc
[modify] https://crrev.com/62ff72d4604ce4bb6f7f612d8ca02436e098695e/ash/common/system/chromeos/network/vpn_list_view.cc
[modify] https://crrev.com/62ff72d4604ce4bb6f7f612d8ca02436e098695e/ash/common/system/chromeos/screen_security/screen_tray_item.h
[delete] https://crrev.com/29810350d256c855e8d1af4c715b28da3a992336/ash/common/system/tray/tray_popup_label_button.cc
[delete] https://crrev.com/29810350d256c855e8d1af4c715b28da3a992336/ash/common/system/tray/tray_popup_label_button.h
[delete] https://crrev.com/29810350d256c855e8d1af4c715b28da3a992336/ash/common/system/tray/tray_popup_label_button_border.cc
[delete] https://crrev.com/29810350d256c855e8d1af4c715b28da3a992336/ash/common/system/tray/tray_popup_label_button_border.h
[modify] https://crrev.com/62ff72d4604ce4bb6f7f612d8ca02436e098695e/ash/common/system/tray/tray_popup_utils.cc
[modify] https://crrev.com/62ff72d4604ce4bb6f7f612d8ca02436e098695e/ash/common/system/tray_accessibility.cc
[modify] https://crrev.com/62ff72d4604ce4bb6f7f612d8ca02436e098695e/ash/common/system/user/user_view.cc
[modify] https://crrev.com/62ff72d4604ce4bb6f7f612d8ca02436e098695e/ash/resources/ash_resources.grd
[delete] https://crrev.com/29810350d256c855e8d1af4c715b28da3a992336/ash/resources/default_100_percent/common/tray_popup_label_button_border.png
[delete] https://crrev.com/29810350d256c855e8d1af4c715b28da3a992336/ash/resources/default_100_percent/common/tray_popup_label_button_hover_background.png
[delete] https://crrev.com/29810350d256c855e8d1af4c715b28da3a992336/ash/resources/default_100_percent/common/tray_popup_label_button_normal_background.png
[delete] https://crrev.com/29810350d256c855e8d1af4c715b28da3a992336/ash/resources/default_200_percent/common/tray_popup_label_button_border.png
[delete] https://crrev.com/29810350d256c855e8d1af4c715b28da3a992336/ash/resources/default_200_percent/common/tray_popup_label_button_hover_background.png
[delete] https://crrev.com/29810350d256c855e8d1af4c715b28da3a992336/ash/resources/default_200_percent/common/tray_popup_label_button_normal_background.png