Navigation: move RestoreType and ReloadType into a separate file

content/browser/frame_host/navigation_request.h

Index: content/browser/frame_host/navigation_request.h
diff --git a/content/browser/frame_host/navigation_request.h b/content/browser/frame_host/navigation_request.h
index 17c1490d1cfd1083443da78059b2fa86ac9eeda8..92c626535a3c098e268442f21c7711954198dd75 100644
--- a/content/browser/frame_host/navigation_request.h
+++ b/content/browser/frame_host/navigation_request.h
@@ -123,9 +123,7 @@ class CONTENT_EXPORT NavigationRequest : public NavigationURLLoaderDelegate {
     return dest_site_instance_.get();
   }
 
-  NavigationEntryImpl::RestoreType restore_type() const {
-    return restore_type_;
-  };
+  RestoreType restore_type() const { return restore_type_; };
 
   bool is_view_source() const { return is_view_source_; };
 
@@ -224,7 +222,7 @@ class CONTENT_EXPORT NavigationRequest : public NavigationURLLoaderDelegate {
   // creation time.
   scoped_refptr<SiteInstanceImpl> source_site_instance_;
   scoped_refptr<SiteInstanceImpl> dest_site_instance_;
-  NavigationEntryImpl::RestoreType restore_type_;
+  RestoreType restore_type_;
   bool is_view_source_;
   int bindings_;