Bug 1586019 - Remove textbox .plain class support. r=bgrins

Differential Revision: https://phabricator.services.mozilla.com/D48074

--HG--
extra : moz-landing-system : lando

editor/reftests/xul/input.css

@@ -34,8 +34,3 @@ html|input.num {
 #linux html|input.num {
   padding-inline-end: 3px;
 }
-
-html|div.plainfield {
-  color: -moz-fieldtext;
-  white-space: pre;
-}

editor/reftests/xul/plain-1.xul

@@ -1,12 +0,0 @@
-<?xml version="1.0"?>
-<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
-
-<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
-        xmlns:html="http://www.w3.org/1999/xhtml"
-        title="Textbox tests">
-
-  <script type="text/javascript" src="platform.js"/>
-
-  <textbox value=" test" class="plain"/>
-      
-</window>

editor/reftests/xul/plain-ref.xul

@@ -1,13 +0,0 @@
-<?xml version="1.0"?>
-<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
-<?xml-stylesheet href="resource://reftest/input.css" type="text/css"?>
-
-<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
-        xmlns:html="http://www.w3.org/1999/xhtml"
-        title="Textbox tests">
-
-  <script type="text/javascript" src="platform.js"/>
-
-  <html:div class="plainfield"> test</html:div>
-      
-</window>

editor/reftests/xul/reftest.list

@@ -6,7 +6,6 @@ fails-if(Android) skip-if(winWidget) == chrome://reftest/content/editor/reftests
 fails-if(Android) skip-if(winWidget) == chrome://reftest/content/editor/reftests/xul/passwd-1.xul chrome://reftest/content/editor/reftests/xul/passwd-ref.xul # Windows: bug 1239170
 fails-if(Android) skip-if(winWidget) == chrome://reftest/content/editor/reftests/xul/passwd-2.xul chrome://reftest/content/editor/reftests/xul/passwd-ref.xul # Windows: bug 1239170
 != chrome://reftest/content/editor/reftests/xul/passwd-3.xul chrome://reftest/content/editor/reftests/xul/passwd-ref.xul
-fails-if(Android) == chrome://reftest/content/editor/reftests/xul/plain-1.xul chrome://reftest/content/editor/reftests/xul/plain-ref.xul # bug 783658
 fails-if(Android) skip-if(winWidget) == chrome://reftest/content/editor/reftests/xul/textbox-1.xul chrome://reftest/content/editor/reftests/xul/textbox-ref.xul # Windows: bug 1239170
 != chrome://reftest/content/editor/reftests/xul/textbox-disabled.xul chrome://reftest/content/editor/reftests/xul/textbox-ref.xul
 # Read-only textboxes look like normal textboxes in windows Vista/7 default theme

toolkit/themes/linux/global/textbox.css

@@ -57,20 +57,6 @@ search-textbox[disabled="true"] {
   color: GrayText;
 }
 
-/* ::::: plain textbox ::::: */
-
-textbox.plain {
-  -moz-appearance: none !important;
-  background-color: transparent;
-  padding: 0px !important;
-  margin: 0px !important;
-  border: none !important;
-}
-
-textbox.plain html|*.textbox-input {
-  padding: 0px !important;
-}
-
 /* ::::: search textbox ::::: */
 
 search-textbox:not([searchbutton]) > .textbox-search-sign {

toolkit/themes/osx/global/textbox.css

@@ -49,18 +49,6 @@ search-textbox[disabled="true"] {
   color: GrayText;
 }
 
-textbox.plain {
-  -moz-appearance: none !important;
-  background-color: transparent;
-  padding: 0px !important;
-  margin: 0px !important;
-  border: none !important;
-}
-
-textbox.plain html|*.textbox-input {
-  padding: 0px !important;
-}
-
 /* ::::: search box ::::: */
 
 search-textbox {

toolkit/themes/windows/global/textbox.css

@@ -63,20 +63,6 @@ search-textbox[disabled="true"] {
   color: GrayText;
 }
 
-/* ::::: plain textbox ::::: */
-
-textbox.plain {
-  -moz-appearance: none !important;
-  background-color: transparent;
-  padding: 0px !important;
-  margin: 0px !important;
-  border: none !important;
-}
-
-textbox.plain html|*.textbox-input {
-  padding: 0px !important;
-}
-
 /* ::::: search textbox ::::: */
 
 search-textbox:not([searchbutton]) > .textbox-search-sign {