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

chrome/browser/plugins/plugin_metadata.cc

Index: chrome/browser/plugins/plugin_metadata.cc
diff --git a/chrome/browser/plugins/plugin_metadata.cc b/chrome/browser/plugins/plugin_metadata.cc
index b28c284f091306b7b5b78424043201f6e40599d3..87b4418a9a0132321e1ae87acbd5a34365bc829a 100644
--- a/chrome/browser/plugins/plugin_metadata.cc
+++ b/chrome/browser/plugins/plugin_metadata.cc
@@ -42,7 +42,7 @@
 PluginMetadata::~PluginMetadata() {
 }
 
-void PluginMetadata::AddVersion(const base::Version& version,
+void PluginMetadata::AddVersion(const Version& version,
                                 SecurityStatus status) {
   DCHECK(versions_.find(version) == versions_.end());
   versions_[version] = status;
@@ -100,14 +100,14 @@
     return SECURITY_STATUS_REQUIRES_AUTHORIZATION;
   }
 
-  base::Version version;
+  Version version;
   content::WebPluginInfo::CreateVersionFromString(plugin.version, &version);
   if (!version.IsValid())
-    version = base::Version("0");
+    version = Version("0");
 
   // |lower_bound| returns the latest version that is not newer than |version|.
-  std::map<base::Version, SecurityStatus, VersionComparator>::const_iterator
-      it = versions_.lower_bound(version);
+  std::map<Version, SecurityStatus, VersionComparator>::const_iterator it =
+      versions_.lower_bound(version);
   // If there is at least one version defined, everything older than the oldest
   // defined version is considered out-of-date.
   if (it == versions_.end())
@@ -116,9 +116,8 @@
   return it->second;
 }
 
-bool PluginMetadata::VersionComparator::operator()(
-    const base::Version& lhs,
-    const base::Version& rhs) const {
+bool PluginMetadata::VersionComparator::operator() (const Version& lhs,
+                                                    const Version& rhs) const {
   // Keep versions ordered by newest (biggest) first.
   return lhs.CompareTo(rhs) > 0;
 }