Show the eject button only for removabled and file handlers.

chrome/browser/chromeos/file_system_provider/service.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_SERVICE_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_SERVICE_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 115 matching lines @@
 
   // Returns a provided file system attached to the the passed
   // |mount_point_name|. If not found, then returns NULL.
   ProvidedFileSystemInterface* GetProvidedFileSystem(
       const std::string& mount_point_name);
 
   // Returns a list of information of all currently installed providing
   // 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 false is
+  // returned.
+  bool GetProvidingExtensionInfo(const std::string& extension_id,
+                                 ProvidingExtensionInfo* result) const;
+
   // Adds and removes observers.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // Gets the singleton instance for the |context|.
   static Service* Get(content::BrowserContext* context);
 
   // extensions::ExtensionRegistryObserver overrides.
   void OnExtensionUnloaded(
       content::BrowserContext* browser_context,
@@ skipping 59 matching lines @@
   base::ThreadChecker thread_checker_;
 
   base::WeakPtrFactory<Service> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(Service);
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_SERVICE_H_