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

chrome/installer/util/google_update_settings.cc

Index: chrome/installer/util/google_update_settings.cc
diff --git a/chrome/installer/util/google_update_settings.cc b/chrome/installer/util/google_update_settings.cc
index 25f418ce8c93e0035a53481977c0e244ed63e943..529c05567baca9897132860065214b6a883c2119 100644
--- a/chrome/installer/util/google_update_settings.cc
+++ b/chrome/installer/util/google_update_settings.cc
@@ -798,8 +798,7 @@
   return cmd_line;
 }
 
-base::Version GoogleUpdateSettings::GetGoogleUpdateVersion(
-    bool system_install) {
+Version GoogleUpdateSettings::GetGoogleUpdateVersion(bool system_install) {
   const HKEY root_key = system_install ? HKEY_LOCAL_MACHINE : HKEY_CURRENT_USER;
   base::string16 version;
   RegKey key;
@@ -809,10 +808,10 @@
                KEY_QUERY_VALUE | KEY_WOW64_32KEY) == ERROR_SUCCESS &&
       key.ReadValue(google_update::kRegGoogleUpdateVersion, &version) ==
           ERROR_SUCCESS) {
-    return base::Version(base::UTF16ToUTF8(version));
-  }
-
-  return base::Version();
+    return Version(base::UTF16ToUTF8(version));
+  }
+
+  return Version();
 }
 
 base::Time GoogleUpdateSettings::GetGoogleUpdateLastStartedAU(