Bug 1857999: Add html namespace declarations for files that are missing it. r=Gijs,webdriver-reviewers,devtools-reviewers

The automated scripts requires an already present namespace prefix for the
xhtml namespace so just manually add those for documents that don't already have
one.

Differential Revision: https://phabricator.services.mozilla.com/D190680

devtools/client/framework/toolbox-window.xhtml

@@ -8,6 +8,7 @@
 <!-- minwidth=50 is sum width of chevron and meatball menu button. -->
 <window
   xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+  xmlns:html="http://www.w3.org/1999/xhtml"
   id="devtools-toolbox-window"
   macanimationtype="document"
   windowtype="devtools:toolbox"

remote/marionette/chrome/test.xhtml

@@ -11,11 +11,9 @@
   title="Title Test"
   windowtype="Test Type"
   xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+  xmlns:html="http://www.w3.org/1999/xhtml"
 >
-  <dialog
-    id="dia"
-    xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
-  >
+  <dialog id="dia">
     <vbox id="things">
       <input
         xmlns="http://www.w3.org/1999/xhtml"

remote/marionette/chrome/test_dialog.xhtml

@@ -10,6 +10,7 @@
 
 <window
   xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+  xmlns:html="http://www.w3.org/1999/xhtml"
   title="&testDialog.title;"
 >
   <dialog id="testDialog" buttons="accept,cancel">

remote/marionette/chrome/test_menupopup.xhtml

@@ -9,6 +9,7 @@
 <window
   id="test-window"
   xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+  xmlns:html="http://www.w3.org/1999/xhtml"
 >
   <popupset id="options-popupset">
     <menupopup id="options-menupopup" position="before_end">

toolkit/components/prompts/content/selectDialog.xhtml

@@ -7,7 +7,10 @@
 <?xml-stylesheet href="chrome://global/skin/global.css" type="text/css"?>
 <!DOCTYPE window>
 
-<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+<window
+  xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+  xmlns:html="http://www.w3.org/1999/xhtml"
+>
   <dialog>
     <script src="chrome://global/content/selectDialog.js" />
     <keyset id="dialogKeys" />