Labelling all the toggles!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/946a9f3c1606d0e90b11303580e9b56d5ecf7432

commit 946a9f3c1606d0e90b11303580e9b56d5ecf7432
Author: hcarmona <hcarmona@chromium.org>
Date: Tue Feb 21 21:40:04 2017

MD-Settings: Add a11y label for network summary items.

R=stevenjb@chromium.org
BUG= 693370 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2699713007
Cr-Commit-Position: refs/heads/master@{#451838}

[modify] https://crrev.com/946a9f3c1606d0e90b11303580e9b56d5ecf7432/chrome/browser/resources/settings/internet_page/network_summary_item.html
[modify] https://crrev.com/946a9f3c1606d0e90b11303580e9b56d5ecf7432/chrome/browser/resources/settings/internet_page/network_summary_item.js
[modify] https://crrev.com/946a9f3c1606d0e90b11303580e9b56d5ecf7432/ui/webui/resources/cr_elements/network/cr_network_list_item.html
[modify] https://crrev.com/946a9f3c1606d0e90b11303580e9b56d5ecf7432/ui/webui/resources/cr_elements/network/cr_network_list_item.js

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/505735cda080442c7d251abc0dcf4601d7b041a7

commit 505735cda080442c7d251abc0dcf4601d7b041a7
Author: hcarmona <hcarmona@chromium.org>
Date: Thu Feb 23 02:44:13 2017

MD-Settings: Adds an a11y label to most toggle buttons.

The only missing toggle button is for the network summary item. That
toggle is non-trivial to label, so it'll be labelled in its own CL.

BUG= 693370 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2705543003
Cr-Commit-Position: refs/heads/master@{#452357}

[modify] https://crrev.com/505735cda080442c7d251abc0dcf4601d7b041a7/chrome/browser/resources/settings/a11y_page/a11y_page.html
[modify] https://crrev.com/505735cda080442c7d251abc0dcf4601d7b041a7/chrome/browser/resources/settings/controls/settings_toggle_button.html
[modify] https://crrev.com/505735cda080442c7d251abc0dcf4601d7b041a7/chrome/browser/resources/settings/date_time_page/date_time_page.html
[modify] https://crrev.com/505735cda080442c7d251abc0dcf4601d7b041a7/chrome/browser/resources/settings/device_page/display.html
[modify] https://crrev.com/505735cda080442c7d251abc0dcf4601d7b041a7/chrome/browser/resources/settings/internet_page/internet_detail_page.html
[modify] https://crrev.com/505735cda080442c7d251abc0dcf4601d7b041a7/chrome/browser/resources/settings/internet_page/network_ip_config.html
[modify] https://crrev.com/505735cda080442c7d251abc0dcf4601d7b041a7/chrome/browser/resources/settings/internet_page/network_proxy.html
[modify] https://crrev.com/505735cda080442c7d251abc0dcf4601d7b041a7/chrome/browser/resources/settings/internet_page/network_siminfo.html
[modify] https://crrev.com/505735cda080442c7d251abc0dcf4601d7b041a7/chrome/browser/resources/settings/languages_page/languages_page.html
[modify] https://crrev.com/505735cda080442c7d251abc0dcf4601d7b041a7/chrome/browser/resources/settings/passwords_and_forms_page/passwords_and_forms_page.html
[modify] https://crrev.com/505735cda080442c7d251abc0dcf4601d7b041a7/chrome/browser/resources/settings/people_page/manage_profile.html
[modify] https://crrev.com/505735cda080442c7d251abc0dcf4601d7b041a7/chrome/browser/resources/settings/people_page/sync_page.html
[modify] https://crrev.com/505735cda080442c7d251abc0dcf4601d7b041a7/chrome/browser/resources/settings/site_settings/protocol_handlers.html

All toggles should be labelled now.