Rewritten MountLibrary to work with non-blocking mount API calls in libcros....

chrome/browser/chromeos/webui/imageburner_ui.h

Index: chrome/browser/chromeos/webui/imageburner_ui.h
===================================================================
--- chrome/browser/chromeos/webui/imageburner_ui.h	(revision 78219)
+++ chrome/browser/chromeos/webui/imageburner_ui.h	(working copy)
@@ -46,9 +46,10 @@
   virtual void RegisterMessages();
 
   // chromeos::MountLibrary::Observer interface
-  virtual void MountChanged(chromeos::MountLibrary* obj,
-                     chromeos::MountEventType evt,
-                     const std::string& path);
+  virtual void DiskChanged(chromeos::MountLibraryEventType event,
+                           const chromeos::MountLibrary::Disk* disk);
+  virtual void DeviceChanged(chromeos::MountLibraryEventType event,
+                             const std::string& device_path);
 
   // chromeos::BurnLibrary::Observer interface
   virtual void ProgressUpdated(chromeos::BurnLibrary* object,