[Offline Pages] Remove expired requests from the queue.

components/offline_pages/background/request_picker.h

Index: components/offline_pages/background/request_picker.h
diff --git a/components/offline_pages/background/request_picker.h b/components/offline_pages/background/request_picker.h
index 3062152ed57e2a5fc6775eb4ec927d365a6d4a1d..d4d77cee3f6c6011aa682c25a6f901130ff765ca 100644
--- a/components/offline_pages/background/request_picker.h
+++ b/components/offline_pages/background/request_picker.h
@@ -20,7 +20,9 @@ typedef bool (RequestPicker::*RequestCompareFunction)(
 
 class RequestPicker {
  public:
-  RequestPicker(RequestQueue* requestQueue, OfflinerPolicy* policy);
+  RequestPicker(RequestQueue* requestQueue,
+                OfflinerPolicy* policy,
+                RequestCoordinator* coordinator);
 
   ~RequestPicker();
 
@@ -63,10 +65,21 @@ class RequestPicker {
   int CompareCreationTime(const SavePageRequest* left,
                           const SavePageRequest* right);
 
-  // unowned pointer to the request queue.
+  // Split all requests into expired ones and still valid ones.
+  void SplitRequests(const std::vector<SavePageRequest>& requests,
+                     std::vector<SavePageRequest>& valid_requests,
+                     std::vector<SavePageRequest>& expired_requests);
+
+  // Callback used after requests get expired.
+  void OnRequestExpired(const std::vector<SavePageRequest>& expired_request,
+                        RequestQueue::UpdateRequestResult result);
+
+  // Unowned pointer to the request queue.
   RequestQueue* queue_;
-  // unowned pointer to the policy object.
+  // Unowned pointer to the policy object.
   OfflinerPolicy* policy_;
+  // Unowned pointer to the request coordinator.
+  RequestCoordinator* coordinator_;
   // Current conditions on the device
   std::unique_ptr<DeviceConditions> current_conditions_;
   // True if we prefer less-tried requests