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

content/browser/plugin_data_remover_impl.cc

Index: content/browser/plugin_data_remover_impl.cc
diff --git a/content/browser/plugin_data_remover_impl.cc b/content/browser/plugin_data_remover_impl.cc
index b591264540003677d4bd1a5a673175f1dad4922c..e192327b8e512a175a81be2cb1382cf6c00cec3e 100644
--- a/content/browser/plugin_data_remover_impl.cc
+++ b/content/browser/plugin_data_remover_impl.cc
@@ -47,10 +47,10 @@
   std::vector<WebPluginInfo> plugins;
   PluginService::GetInstance()->GetPluginInfoArray(
       GURL(), kFlashPluginSwfMimeType, allow_wildcard, &plugins, NULL);
-  base::Version min_version(kMinFlashVersion);
+  Version min_version(kMinFlashVersion);
   for (std::vector<WebPluginInfo>::iterator it = plugins.begin();
        it != plugins.end(); ++it) {
-    base::Version version;
+    Version version;
     WebPluginInfo::CreateVersionFromString(it->version, &version);
     if (version.IsValid() && min_version.CompareTo(version) == -1)
       supported_plugins->push_back(*it);