Revert of Remove scoped styles.

Source/core/testing/InternalSettings.cpp

Index: Source/core/testing/InternalSettings.cpp
diff --git a/Source/core/testing/InternalSettings.cpp b/Source/core/testing/InternalSettings.cpp
index 9061ef481a16737e319fabe63cb350960145b368..a5dd5d36c1c4607d8edf9fcc4d90cd80d9b16627 100644
--- a/Source/core/testing/InternalSettings.cpp
+++ b/Source/core/testing/InternalSettings.cpp
@@ -60,6 +60,7 @@
 InternalSettings::Backup::Backup(Settings* settings)
     : m_originalCSSExclusionsEnabled(RuntimeEnabledFeatures::cssExclusionsEnabled())
     , m_originalAuthorShadowDOMForAnyElementEnabled(RuntimeEnabledFeatures::authorShadowDOMForAnyElementEnabled())
+    , m_originalStyleScoped(RuntimeEnabledFeatures::styleScopedEnabled())
     , m_originalCSP(RuntimeEnabledFeatures::experimentalContentSecurityPolicyFeaturesEnabled())
     , m_originalOverlayScrollbarsEnabled(RuntimeEnabledFeatures::overlayScrollbarsEnabled())
     , m_originalEditingBehavior(settings->editingBehaviorType())
@@ -80,6 +81,7 @@
 {
     RuntimeEnabledFeatures::setCSSExclusionsEnabled(m_originalCSSExclusionsEnabled);
     RuntimeEnabledFeatures::setAuthorShadowDOMForAnyElementEnabled(m_originalAuthorShadowDOMForAnyElementEnabled);
+    RuntimeEnabledFeatures::setStyleScopedEnabled(m_originalStyleScoped);
     RuntimeEnabledFeatures::setExperimentalContentSecurityPolicyFeaturesEnabled(m_originalCSP);
     RuntimeEnabledFeatures::setOverlayScrollbarsEnabled(m_originalOverlayScrollbarsEnabled);
     settings->setEditingBehaviorType(m_originalEditingBehavior);
@@ -174,6 +176,11 @@
     RuntimeEnabledFeatures::setAuthorShadowDOMForAnyElementEnabled(isEnabled);
 }
 
+void InternalSettings::setStyleScopedEnabled(bool enabled)
+{
+    RuntimeEnabledFeatures::setStyleScopedEnabled(enabled);
+}
+
 void InternalSettings::setExperimentalContentSecurityPolicyFeaturesEnabled(bool enabled)
 {
     RuntimeEnabledFeatures::setExperimentalContentSecurityPolicyFeaturesEnabled(enabled);