Revert of base: Remove using:: declaration from version.h header.

chrome/installer/util/google_chrome_distribution.h

Index: chrome/installer/util/google_chrome_distribution.h
diff --git a/chrome/installer/util/google_chrome_distribution.h b/chrome/installer/util/google_chrome_distribution.h
index f29d9c66e9bb171b57399b50e7b27e054f0aff3d..4f21d88c14815446380a37ff56ceb57a89e54c67 100644
--- a/chrome/installer/util/google_chrome_distribution.h
+++ b/chrome/installer/util/google_chrome_distribution.h
@@ -30,7 +30,7 @@
   //   concatenated to the survey url if the file in local_data_path indicates
   //   the user has opted in to providing anonymous usage data.
   void DoPostUninstallOperations(
-      const base::Version& version,
+      const Version& version,
       const base::FilePath& local_data_path,
       const base::string16& distribution_data) override;