Update the request count when a request fails.

components/offline_pages/background/request_coordinator_unittest.cc

Index: components/offline_pages/background/request_coordinator_unittest.cc
diff --git a/components/offline_pages/background/request_coordinator_unittest.cc b/components/offline_pages/background/request_coordinator_unittest.cc
index 34f29f99bb5f57153ee7a4e718ccdd69e9b4e3b8..1bdc0fec2949202b371d59d996112af83fdc5a0b 100644
--- a/components/offline_pages/background/request_coordinator_unittest.cc
+++ b/components/offline_pages/background/request_coordinator_unittest.cc
@@ -357,6 +357,12 @@ TEST_F(RequestCoordinatorTest, OfflinerDoneRequestFailed) {
   EnableOfflinerCallback(true);
   SendOfflinerDoneCallback(request,
                            Offliner::RequestStatus::PRERENDERING_FAILED);
+  // There will be one request left in the queue after the prerender fails, stop
+  // processing now so that it will remain in the queue for us to check.  This
+  // won't affect the offliner done callback other than preventing
+  // TryNextRequest from doing anything.
+  coordinator()->StopProcessing();
+
   PumpLoop();
 
   // Verify the request is not removed from the queue, and wait for callbacks.
@@ -367,7 +373,9 @@ TEST_F(RequestCoordinatorTest, OfflinerDoneRequestFailed) {
 
   // Still one request in the queue.
   EXPECT_EQ(1UL, last_requests().size());
-  // TODO(dougarnett): Verify retry count gets incremented.
+  // Verify retry count was incremented.
+  const SavePageRequest& found_request = last_requests().front();
+  EXPECT_EQ(1L, found_request.attempt_count());
 }
 
 // This tests a StopProcessing call before we have actually started the