Move MimeTypeResourceHandler before ThrottlingResourceHandler

content/browser/loader/resource_handler.h

Index: content/browser/loader/resource_handler.h
diff --git a/content/browser/loader/resource_handler.h b/content/browser/loader/resource_handler.h
index caf9a7a6803194a918f1b547a803db7393015ac2..f6bbeede4312a3419690f1c555cafa54873e906d 100644
--- a/content/browser/loader/resource_handler.h
+++ b/content/browser/loader/resource_handler.h
@@ -108,6 +108,18 @@ class CONTENT_EXPORT ResourceHandler
   // with OnDataDownloaded calls.
   virtual void OnDataDownloaded(int bytes_downloaded) = 0;
 
+  // Whether this ResourceHandler is a leaf handler (ie the last handler in a
+  // chain of handlers).
+  virtual bool IsLeafHandler() const;
+
+  // If this handler points to a leaf handler, replaces it with |new_handler|
+  // while delivering |payload_for_old_handler| and simulating the end of the
+  // request on the former leaf handler.
+  // This should never be called on a leaf handler.
+  virtual void InstallNewLeafHandler(
+      std::unique_ptr<ResourceHandler> new_handler,
+      const std::string& payload_for_old_handler);
+
  protected:
   ResourceHandler(net::URLRequest* request);