Detach the dependency from host_content_settings_map to extension.

chrome/browser/content_settings/content_settings_provider.h

Index: chrome/browser/content_settings/content_settings_provider.h
diff --git a/chrome/browser/content_settings/content_settings_provider.h b/chrome/browser/content_settings/content_settings_provider.h
index 48e15ccb11b158c81f2769645fe04197d7b0841a..0b1092fde23a405516e88e7ab120d64f1b747ab1 100644
--- a/chrome/browser/content_settings/content_settings_provider.h
+++ b/chrome/browser/content_settings/content_settings_provider.h
@@ -13,6 +13,7 @@
 #include <vector>
 
 #include "base/values.h"
+#include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 
 class ContentSettingsPattern;
@@ -69,6 +70,12 @@ class ProviderInterface {
   // Afterwards, none of the methods above that should only be called on the UI
   // thread should be called anymore.
   virtual void ShutdownOnUIThread() = 0;
+
+  // Returns the name of the provider.
+  virtual std::string GetProviderName() const = 0;
+
+  // Returns the SettingSource of the provider.
+  virtual content_settings::SettingSource GetSettingSource() const = 0;
 };
 
 }  // namespace content_settings