Refactor ProtectedMediaIdentifierPermissionContext to derive from PermissionContextBase.

chrome/browser/content_settings/permission_context_base.h

Index: chrome/browser/content_settings/permission_context_base.h
diff --git a/chrome/browser/content_settings/permission_context_base.h b/chrome/browser/content_settings/permission_context_base.h
index f2acb06a8d498a7a079d8d517bc1f1d854df2fe1..d2370c7a585f9fbc5d92243d18fb7d92ba4b9694 100644
--- a/chrome/browser/content_settings/permission_context_base.h
+++ b/chrome/browser/content_settings/permission_context_base.h
@@ -109,6 +109,9 @@ class PermissionContextBase : public KeyedService {
   // Return an instance of the infobar queue controller, creating it if needed.
   PermissionQueueController* GetQueueController();
 
+  // Returns the profile associated with this permission context.
+  Profile* profile() const;
+
   // Store the decided permission as a content setting.
   // virtual since the permission might be stored with different restrictions
   // (for example for desktop notifications).