Revert of Disallow non-namespaced use of base::Version.

chrome/browser/obsolete_system/obsolete_system_linux.cc

Index: chrome/browser/obsolete_system/obsolete_system_linux.cc
diff --git a/chrome/browser/obsolete_system/obsolete_system_linux.cc b/chrome/browser/obsolete_system/obsolete_system_linux.cc
index cce4e83e22a23f2624157b3152940f14608cf4bb..80ba5c649feb43645c2a47f3b320eb471417f6c6 100644
--- a/chrome/browser/obsolete_system/obsolete_system_linux.cc
+++ b/chrome/browser/obsolete_system/obsolete_system_linux.cc
@@ -31,7 +31,7 @@
   // 14.04 does not actually require glibc 2.19. Thus this function checks for
   // glibc 2.17 as the minimum requirement, so Ubuntu 12.04 (glibc 2.15) will
   // be considered obsolete, but RHEL 7 (glibc 2.17) will not.
-  base::Version version(gnu_get_libc_version());
+  Version version(gnu_get_libc_version());
   if (!version.IsValid() || version.components().size() != 2)
     return false;