Bug 1849937 - Remove svg.embedder-prefers-color-scheme.content.enabled pref r=emilio

Differential Revision: https://phabricator.services.mozilla.com/D258826

Author: mr-cheffy

layout/svg/SVGImageContext.cpp

@@ -38,8 +38,7 @@ void SVGImageContext::MaybeStoreContextPaint(SVGImageContext& aContext,
     return;
   }
 
-  if (StaticPrefs::svg_embedder_prefers_color_scheme_content_enabled() ||
-      aPresContext.Document()->ChromeRulesEnabled()) {
+  {
     auto scheme = LookAndFeel::ColorSchemeForStyle(
         *aPresContext.Document(), aStyle.StyleUI()->mColorScheme.bits,
         ColorSchemeMode::Preferred);

modules/libpref/init/StaticPrefList.yaml

@@ -17329,13 +17329,6 @@
   value: false
   mirror: always
 
-# This pref controls whether the `prefers-color-scheme` value of SVG images
-# reacts to the embedder `color-scheme` in content.
-- name: svg.embedder-prefers-color-scheme.content.enabled
-  type: RelaxedAtomicBool
-  value: true
-  mirror: always
-
 # Enables the 'context-fill' and 'context-stroke' keywords for particular
 # domains. We expect this list to be Mozilla-controlled properties, since the
 # 'context-*' keywords are not part of any spec. We expect to remove this