Bug 1851098 - Remove layout.css.page-size.enabled pref r=emilio

Differential Revision: https://phabricator.services.mozilla.com/D187348

layout/base/tests/chrome/chrome.ini

@@ -3,7 +3,6 @@ prefs =
   dom.window.sizeToContent.enabled=true
   layout.css.individual-transform.enabled=true
   layout.css.motion-path.enabled=true
-  layout.css.page-size.enabled=true
 skip-if = os == 'android'
 support-files =
   animated.gif

modules/libpref/init/StaticPrefList.yaml

@@ -8604,13 +8604,6 @@
   mirror: always
   rust: true
 
-# Enables support for the size property inside of CSS @page rules.
-- name: layout.css.page-size.enabled
-  type: RelaxedAtomicBool
-  value: true
-  mirror: always
-  rust: true
-
 # Enables support for different CSS page sizes on each page when printing.
 - name: layout.css.allow-mixed-page-sizes
   type: RelaxedAtomicBool

servo/components/style/properties/longhands/page.mako.rs

@@ -12,7 +12,6 @@ ${helpers.predefined_type(
     "PageSize",
     "computed::PageSize::auto()",
     engines="gecko",
-    gecko_pref="layout.css.page-size.enabled",
     initial_specified_value="specified::PageSize::auto()",
     spec="https://drafts.csswg.org/css-page-3/#page-size-prop",
     boxed=True,

testing/web-platform/meta/css/css-page/parsing/size-001.html.ini

@@ -1,4 +0,0 @@
-[size-001.html]
-  prefs: [layout.css.page-size.enabled:true]
-  expected:
-    if (os == "android") and fission: [TIMEOUT, OK]