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

gpu/config/gpu_info_collector_win.cc

Index: gpu/config/gpu_info_collector_win.cc
diff --git a/gpu/config/gpu_info_collector_win.cc b/gpu/config/gpu_info_collector_win.cc
index 26a8f030d7c2de777a1afd13e0632c0f9db9fc07..f51764da823fb50542f6e6ccdc03fbbca6bce0e3 100644
--- a/gpu/config/gpu_info_collector_win.cc
+++ b/gpu/config/gpu_info_collector_win.cc
@@ -53,23 +53,23 @@
 
 // Returns the display link driver version or an invalid version if it is
 // not installed.
-base::Version DisplayLinkVersion() {
+Version DisplayLinkVersion() {
   base::win::RegKey key;
 
   if (key.Open(HKEY_LOCAL_MACHINE, L"SOFTWARE", KEY_READ | KEY_WOW64_64KEY))
-    return base::Version();
+    return Version();
 
   if (key.OpenKey(L"DisplayLink", KEY_READ | KEY_WOW64_64KEY))
-    return base::Version();
+    return Version();
 
   if (key.OpenKey(L"Core", KEY_READ | KEY_WOW64_64KEY))
-    return base::Version();
+    return Version();
 
   base::string16 version;
   if (key.ReadValue(L"Version", &version))
-    return base::Version();
-
-  return base::Version(base::UTF16ToASCII(version));
+    return Version();
+
+  return Version(base::UTF16ToASCII(version));
 }
 
 // Returns whether Lenovo dCute is installed.