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

chrome/installer/util/browser_distribution.cc

Index: chrome/installer/util/browser_distribution.cc
diff --git a/chrome/installer/util/browser_distribution.cc b/chrome/installer/util/browser_distribution.cc
index bf37f7c92c8e6ce463c21158fd828749b302201f..4189fd96b60e4c1a3f48b802d03f6515a4d81aa9 100644
--- a/chrome/installer/util/browser_distribution.cc
+++ b/chrome/installer/util/browser_distribution.cc
@@ -142,9 +142,9 @@
 }
 
 void BrowserDistribution::DoPostUninstallOperations(
-    const base::Version& version,
-    const base::FilePath& local_data_path,
-    const base::string16& distribution_data) {}
+    const Version& version, const base::FilePath& local_data_path,
+    const base::string16& distribution_data) {
+}
 
 base::string16 BrowserDistribution::GetActiveSetupGuid() {
   return kChromiumActiveSetupGuid;