Add a unified observer to replace NetworkManagerObserver

chrome/browser/chromeos/extensions/file_browser_event_router.h

Index: chrome/browser/chromeos/extensions/file_browser_event_router.h
diff --git a/chrome/browser/chromeos/extensions/file_browser_event_router.h b/chrome/browser/chromeos/extensions/file_browser_event_router.h
index 868c04279e62cfa774187a328b49e33d3dc1c66c..46459c99177ba7b8adfafd8c6b56381f80e8565a 100644
--- a/chrome/browser/chromeos/extensions/file_browser_event_router.h
+++ b/chrome/browser/chromeos/extensions/file_browser_event_router.h
@@ -14,9 +14,9 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "base/synchronization/lock.h"
-#include "chrome/browser/chromeos/cros/network_library.h"
 #include "chrome/browser/chromeos/drive/drive_file_system_observer.h"
 #include "chrome/browser/chromeos/drive/drive_resource_metadata.h"
+#include "chrome/browser/chromeos/net/connectivity_state_helper_observer.h"
 #include "chrome/browser/google_apis/drive_service_interface.h"
 #include "chrome/browser/google_apis/operation_registry.h"
 #include "chromeos/disks/disk_mount_manager.h"
@@ -35,7 +35,7 @@ class DriveFileSystemInterface;
 class FileBrowserEventRouter
     : public base::RefCountedThreadSafe<FileBrowserEventRouter>,
       public chromeos::disks::DiskMountManager::Observer,
-      public chromeos::NetworkLibrary::NetworkManagerObserver,
+      public chromeos::ConnectivityStateHelperObserver,
       public drive::DriveFileSystemObserver,
       public google_apis::DriveServiceObserver {
  public:
@@ -88,9 +88,8 @@ class FileBrowserEventRouter
       chromeos::FormatError error_code,
       const std::string& device_path) OVERRIDE;
 
-  // chromeos::NetworkLibrary::NetworkManagerObserver override.
-  virtual void OnNetworkManagerChanged(
-      chromeos::NetworkLibrary* network_library) OVERRIDE;
+  // chromeos::ConnectivityStateHelperObserver override.
+  virtual void NetworkManagerChanged() OVERRIDE;
 
   // drive::DriveServiceObserver overrides.
   virtual void OnProgressUpdate(