Remove Views-Like Checkboxes from WebUI

Currently, WebUI refers to Views Resources. It should use the web
default checkboxes already used by components like devtools

BUG=967845

Change-Id: I5a56633b8ddc8b513d7407cfc5278c797e0fdff8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1632427
Commit-Queue: Robert Liao <robliao@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665230}

ui/webui/resources/css/apps/common.css

@@ -117,54 +117,3 @@ button.blue-button[disabled] {
     url(chrome://resources/images/2x/apps/blue_button_inactive.png)
         2x) 5 fill / 5px / 2px repeat;
 }
-
-input[type='checkbox'] {
-  -webkit-appearance: none;
-  border: none;
-  outline: none;
-}
-
-input[type='checkbox']::after {
-  content: '';
-  display: block;
-  height: 16px;
-  left: -2px;
-  top: -2px;
-  width: 16px;
-}
-
-input[type='checkbox']:not(:checked)::after {
-  background-image: -webkit-image-set(
-    url(chrome://resources/images/apps/checkbox.png) 1x,
-    url(chrome://resources/images/2x/apps/checkbox.png) 2x);
-}
-
-input[type='checkbox']:focus:not(:checked)::after {
-  background-image: -webkit-image-set(
-    url(chrome://resources/images/apps/checkbox_focused.png) 1x,
-    url(chrome://resources/images/2x/apps/checkbox_focused.png) 2x);
-}
-
-input[type='checkbox']:disabled:not(:checked)::after {
-  background-image: -webkit-image-set(
-    url(chrome://resources/images/apps/checkbox_inactive.png) 1x,
-    url(chrome://resources/images/2x/apps/checkbox_inactive.png) 2x);
-}
-
-input[type='checkbox']:checked::after {
-  background-image: -webkit-image-set(
-    url(chrome://resources/images/apps/checkbox_checked.png) 1x,
-    url(chrome://resources/images/2x/apps/checkbox_checked.png) 2x);
-}
-
-input[type='checkbox']:focus:checked::after {
-  background-image: -webkit-image-set(
-    url(chrome://resources/images/apps/checkbox_focused_checked.png) 1x,
-    url(chrome://resources/images/2x/apps/checkbox_focused_checked.png) 2x);
-}
-
-input[type='checkbox']:disabled:checked::after {
-  background-image: -webkit-image-set(
-    url(chrome://resources/images/apps/checkbox_checked_inactive.png) 1x,
-    url(chrome://resources/images/2x/apps/checkbox_checked_inactive.png) 2x);
-}