gdata: Apply correct mount label when mounting archives in GData

chrome/browser/chromeos/disks/mock_disk_mount_manager.h

Index: chrome/browser/chromeos/disks/mock_disk_mount_manager.h
diff --git a/chrome/browser/chromeos/disks/mock_disk_mount_manager.h b/chrome/browser/chromeos/disks/mock_disk_mount_manager.h
index d728f180d870a563708fdc88f39d11bea19bbbad..9b3d85877740eff110a9fd87311e71017c260672 100644
--- a/chrome/browser/chromeos/disks/mock_disk_mount_manager.h
+++ b/chrome/browser/chromeos/disks/mock_disk_mount_manager.h
@@ -30,8 +30,8 @@ class MockDiskMountManager : public DiskMountManager {
   MOCK_CONST_METHOD0(mount_points,
                      const DiskMountManager::MountPointMap&(void));
   MOCK_METHOD0(RequestMountInfoRefresh, void(void));
-  MOCK_METHOD3(MountPath, void(const std::string&, const std::string&,
-                               MountType));
+  MOCK_METHOD4(MountPath, void(const std::string&, const std::string&,
+                               const std::string&, MountType));
   MOCK_METHOD1(UnmountPath, void(const std::string&));
   MOCK_METHOD3(GetSizeStatsOnFileThread, void(const std::string&, size_t*,
                                               size_t*));