Update component extension reload backoff logic.

chrome/browser/background/background_contents_service.h

Index: chrome/browser/background/background_contents_service.h
diff --git a/chrome/browser/background/background_contents_service.h b/chrome/browser/background/background_contents_service.h
index 76c374bf66b0ec286d9e2542e4770be32e979f10..60db5b18bcb3b264c8bee3d4a2efb6e308179ad4 100644
--- a/chrome/browser/background/background_contents_service.h
+++ b/chrome/browser/background/background_contents_service.h
@@ -216,6 +216,11 @@ class BackgroundContentsService : private content::NotificationObserver,
   // set of background apps as new background contents are opened/closed).
   void SendChangeNotification(Profile* profile);
 
+  // Checks whether there has been additional |extension_id| failures. If not,
+  // delete the BackoffEntry corresponding to |extension_id|, if exists.
+  void MaybeClearBackoffEntry(const std::string extension_id,
+                              int expected_failure_count);
+
   // Delay (in ms) before restarting a force-installed extension that crashed.
   static int restart_delay_in_ms_;