Show the eject button only for removabled and file handlers.

chrome/browser/chromeos/file_system_provider/service.h

Index: chrome/browser/chromeos/file_system_provider/service.h
diff --git a/chrome/browser/chromeos/file_system_provider/service.h b/chrome/browser/chromeos/file_system_provider/service.h
index 54d6bf30bb1bd8e7433c10bac5bf6bd2fa81b912..c49471120d0a06ce1560c7a4e043b37b7b79cae8 100644
--- a/chrome/browser/chromeos/file_system_provider/service.h
+++ b/chrome/browser/chromeos/file_system_provider/service.h
@@ -133,6 +133,12 @@ class Service : public KeyedService,
   // extensions.
   std::vector<ProvidingExtensionInfo> GetProvidingExtensionInfoList() const;
 
+  // Fills information of the specified providing extension and returns true.
+  // If the extension is not a provider, or it doesn't exist, then NULL is
+  // returned.
+  bool GetProvidingExtensionInfo(const std::string& extension_id,
+                                 ProvidingExtensionInfo* result) const;
+
   // Adds and removes observers.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);