Revert of [BackgroundSync] Trigger Background Sync events when Chrome is backgrounded on Android

content/browser/background_sync/background_sync_network_observer.h

Index: content/browser/background_sync/background_sync_network_observer.h
diff --git a/content/browser/background_sync/background_sync_network_observer.h b/content/browser/background_sync/background_sync_network_observer.h
index 4d47cc6a6c3970396a3195a31a271ab3df2122f4..7c81f738a92c01b799441e14a3366d71d4741f28 100644
--- a/content/browser/background_sync/background_sync_network_observer.h
+++ b/content/browser/background_sync/background_sync_network_observer.h
@@ -13,7 +13,7 @@
 namespace content {
 
 class CONTENT_EXPORT BackgroundSyncNetworkObserver
-    : public net::NetworkChangeNotifier::NetworkChangeObserver {
+    : net::NetworkChangeNotifier::NetworkChangeObserver {
  public:
   // Creates a BackgroundSyncNetworkObserver. |network_changed_callback| is
   // called when the network connection changes asynchronously via PostMessage.
@@ -21,36 +21,21 @@
 
   ~BackgroundSyncNetworkObserver() override;
 
-  // Enable or disable notifications coming from the NetworkChangeNotifier. (For
-  // preventing flakes in tests)
-  static void SetIgnoreNetworkChangeNotifierForTests(bool ignore);
-
   // Returns true if the state of the network meets the needs of
   // |network_state|.
   bool NetworkSufficient(SyncNetworkState network_state);
+
+ private:
+  void NotifyNetworkChanged();
 
   // NetworkChangeObserver overrides
   void OnNetworkChanged(
       net::NetworkChangeNotifier::ConnectionType connection_type) override;
 
- private:
-  friend class BackgroundSyncBrowserTest;
-  friend class BackgroundSyncManagerTest;
-
-  // Calls NotifyNetworkChanged if the connection type has changed.
-  void NotifyManagerIfNetworkChanged(
-      net::NetworkChangeNotifier::ConnectionType connection_type);
-
-  void NotifyNetworkChanged();
-
   net::NetworkChangeNotifier::ConnectionType connection_type_;
 
   // The callback to run when the network changes.
   base::Closure network_changed_callback_;
-
-  // Set true to ignore notifications coming from the NetworkChangeNotifier
-  // (to prevent flakes in tests).
-  static bool ignore_network_change_notifier_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundSyncNetworkObserver);
 };