Ensure settings returned from Content Settings providers are valid

chrome/browser/content_settings/content_settings_internal_extension_provider.cc

Index: chrome/browser/content_settings/content_settings_internal_extension_provider.cc
diff --git a/chrome/browser/content_settings/content_settings_internal_extension_provider.cc b/chrome/browser/content_settings/content_settings_internal_extension_provider.cc
index 1b818fe1eb3b12fb2647e16d988c32540293a860..d15d0b6f470e5e94a0aa46a60b8a44cd869bff4a 100644
--- a/chrome/browser/content_settings/content_settings_internal_extension_provider.cc
+++ b/chrome/browser/content_settings/content_settings_internal_extension_provider.cc
@@ -10,6 +10,8 @@
 #include "chrome/browser/pdf/pdf_extension_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_content_client.h"
+#include "components/content_settings/core/browser/content_settings_info.h"
+#include "components/content_settings/core/browser/content_settings_registry.h"
 #include "components/content_settings/core/browser/content_settings_rule.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
@@ -209,6 +211,9 @@ void InternalExtensionProvider::SetContentSettingForExtensionAndResource(
                              CONTENT_SETTINGS_TYPE_PLUGINS,
                              resource);
     } else {
+      DCHECK(content_settings::ContentSettingsRegistry::GetInstance()
+                 ->Get(CONTENT_SETTINGS_TYPE_PLUGINS)
+                 ->IsSettingValid(setting));
       // Do not set a timestamp for extension settings.
       value_map_.SetValue(primary_pattern, secondary_pattern,
                           CONTENT_SETTINGS_TYPE_PLUGINS, resource, base::Time(),