[Offline Pages] Remove expired requests from the queue.

components/offline_pages/background/request_coordinator.cc

Index: components/offline_pages/background/request_coordinator.cc
diff --git a/components/offline_pages/background/request_coordinator.cc b/components/offline_pages/background/request_coordinator.cc
index cde6cede1f0810c79d13b57acbe799e983b330d1..15e3a675b7374f4883a49ee7942475391bf41feb 100644
--- a/components/offline_pages/background/request_coordinator.cc
+++ b/components/offline_pages/background/request_coordinator.cc
@@ -63,7 +63,7 @@ RequestCoordinator::RequestCoordinator(std::unique_ptr<OfflinerPolicy> policy,
           policy_->GetSinglePageTimeLimitInSeconds())),
       weak_ptr_factory_(this) {
   DCHECK(policy_ != nullptr);
-  picker_.reset(new RequestPicker(queue_.get(), policy_.get()));
+  picker_.reset(new RequestPicker(queue_.get(), policy_.get(), this));
 }
 
 RequestCoordinator::~RequestCoordinator() {}
@@ -364,4 +364,10 @@ void RequestCoordinator::GetOffliner() {
   }
 }
 
+void RequestCoordinator::NotifyRequestsExpired(
+    const std::vector<SavePageRequest>& expired_requests,
+    RequestQueue::UpdateRequestResult result) {
+  // Notify observers that requests are expired.
+}
+
 }  // namespace offline_pages