Use stub impl when libcros fails to load

chrome/browser/chromeos/cros/update_library.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/cros/update_library.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/observer_list.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
 #include "content/browser/browser_thread.h"
 
 namespace chromeos {
 
 class UpdateLibraryImpl : public UpdateLibrary {
  public:
   UpdateLibraryImpl() : status_connection_(NULL) {}
 
   virtual ~UpdateLibraryImpl() {
     if (status_connection_) {
       chromeos::DisconnectUpdateProgress(status_connection_);
       status_connection_ = NULL;
     }
   }
 
   // Begin UpdateLibrary implementation.
   virtual void Init() OVERRIDE {
-    if (CrosLibrary::Get()->EnsureLoaded()) {
-      CHECK(!status_connection_) << "Already initialized";
-      status_connection_ =
-          chromeos::MonitorUpdateStatus(&UpdateStatusHandler, this);
-      // Asynchronously load the initial state.
-      chromeos::RequestUpdateStatus(&UpdateStatusHandler, this);
-    }
+    DCHECK(CrosLibrary::Get()->libcros_loaded());
+    CHECK(!status_connection_) << "Already initialized";
+    status_connection_ =
+        chromeos::MonitorUpdateStatus(&UpdateStatusHandler, this);
+    // Asynchronously load the initial state.
+    chromeos::RequestUpdateStatus(&UpdateStatusHandler, this);
   }
 
   virtual void AddObserver(Observer* observer) OVERRIDE {
     observers_.AddObserver(observer);
   }
 
   virtual void RemoveObserver(Observer* observer) OVERRIDE {
     observers_.RemoveObserver(observer);
   }
 
   virtual bool HasObserver(Observer* observer) OVERRIDE {
     return observers_.HasObserver(observer);
   }
 
   virtual void RequestUpdateCheck(chromeos::UpdateCallback callback,
                                   void* user_data) OVERRIDE {
-    if (CrosLibrary::Get()->EnsureLoaded())
-      chromeos::RequestUpdateCheck(callback, user_data);
+    chromeos::RequestUpdateCheck(callback, user_data);
   }
 
   virtual bool RebootAfterUpdate() OVERRIDE {
-    if (!CrosLibrary::Get()->EnsureLoaded())
-      return false;
-
     return RebootIfUpdated();
   }
 
   virtual void SetReleaseTrack(const std::string& track) OVERRIDE {
-    if (CrosLibrary::Get()->EnsureLoaded())
-      chromeos::SetUpdateTrack(track);
+    chromeos::SetUpdateTrack(track);
   }
 
   virtual void GetReleaseTrack(chromeos::UpdateTrackCallback callback,
                                void* user_data) OVERRIDE {
-    if (CrosLibrary::Get()->EnsureLoaded())
-      chromeos::RequestUpdateTrack(callback, user_data);
+    chromeos::RequestUpdateTrack(callback, user_data);
   }
   // End UpdateLibrary implementation.
 
   const UpdateLibrary::Status& status() const {
     return status_;
   }
 
  private:
   static void UpdateStatusHandler(void* object, const UpdateProgress& status) {
     UpdateLibraryImpl* impl = static_cast<UpdateLibraryImpl*>(object);
@@ skipping 66 matching lines @@
     impl = new UpdateLibraryImpl();
   impl->Init();
   return impl;
 }
 
 }  // namespace chromeos
 
 // Allows InvokeLater without adding refcounting. This class is a Singleton and
 // won't be deleted until it's last InvokeLater is run.
 DISABLE_RUNNABLE_METHOD_REFCOUNT(chromeos::UpdateLibraryImpl);