Update the request count when a request fails.

components/offline_pages/background/request_queue.h

Index: components/offline_pages/background/request_queue.h
diff --git a/components/offline_pages/background/request_queue.h b/components/offline_pages/background/request_queue.h
index 4aed02cab7512ec912ec7be36babdaf56b5d7643..869f072e1f69594fa99e2999fe624176568d180c 100644
--- a/components/offline_pages/background/request_queue.h
+++ b/components/offline_pages/background/request_queue.h
@@ -12,6 +12,7 @@
 
 #include "base/callback.h"
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
 
 namespace offline_pages {
 
@@ -75,6 +76,12 @@ class RequestQueue {
   // |callback|.
   void RemoveRequest(int64_t request_id, const UpdateRequestCallback& callback);
 
+  void GetForUpdateDone(
+      const RequestQueue::UpdateRequestCallback& update_callback,
+      const SavePageRequest& update_request,
+      bool success,
+      const std::vector<SavePageRequest>& requests);
+
  private:
   // Callback used by |PurgeRequests|.
   typedef base::Callback<void(UpdateRequestResult,
@@ -88,6 +95,9 @@ class RequestQueue {
 
   std::unique_ptr<RequestQueueStore> store_;
 
+  // Allows us to pass a weak pointer to callbacks.
+  base::WeakPtrFactory<RequestQueue> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(RequestQueue);
 };