Prepare to abstract PersistedData by making it part of the configurator.

components/update_client/configurator.h

Index: components/update_client/configurator.h
diff --git a/components/update_client/configurator.h b/components/update_client/configurator.h
index be2caff58d870274f40463d99995f94dc01e990b..9ee70df6bd9e05f92812382bb465bbcb464e1a2d 100644
--- a/components/update_client/configurator.h
+++ b/components/update_client/configurator.h
@@ -26,6 +26,7 @@ class URLRequestContextGetter;
 namespace update_client {
 
 class OutOfProcessPatcher;
+class PersistedData;
 
 // Controls the component updater behavior.
 // TODO(sorin): this class will be split soon in two. One class controls
@@ -133,6 +134,10 @@ class Configurator : public base::RefCountedThreadSafe<Configurator> {
   // called only from a blocking pool thread, as it may access the file system.
   virtual bool IsPerUserInstall() const = 0;
 
+  // Returns a PersistedData object that update_client can use to store
+  // persistent update information.
+  virtual std::unique_ptr<PersistedData> CreateMetadata() const = 0;
+
  protected:
   friend class base::RefCountedThreadSafe<Configurator>;