Update all users of base::Version to explicitly specify the namespace, and clean up the 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 33f83a029688fdfc5c5133f03e029a39ddf78641..f0fc6d4d8afadfae7643cf59a495a4de42355279 100644
--- a/chrome/browser/plugins/plugin_metadata.cc
+++ b/chrome/browser/plugins/plugin_metadata.cc
@@ -39,7 +39,7 @@ PluginMetadata::PluginMetadata(const std::string& identifier,
 PluginMetadata::~PluginMetadata() {
 }
 
-void PluginMetadata::AddVersion(const Version& version,
+void PluginMetadata::AddVersion(const base::Version& version,
                                 SecurityStatus status) {
   DCHECK(versions_.find(version) == versions_.end());
   versions_[version] = status;
@@ -97,14 +97,14 @@ PluginMetadata::SecurityStatus PluginMetadata::GetSecurityStatus(
     return SECURITY_STATUS_REQUIRES_AUTHORIZATION;
   }
 
-  Version version;
+  base::Version version;
   content::WebPluginInfo::CreateVersionFromString(plugin.version, &version);
   if (!version.IsValid())
-    version = Version("0");
+    version = base::Version("0");
 
   // |lower_bound| returns the latest version that is not newer than |version|.
-  std::map<Version, SecurityStatus, VersionComparator>::const_iterator it =
-      versions_.lower_bound(version);
+  std::map<base::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   // defined version is considered out-of-date.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())
@@ -113,8 +113,8 @@ PluginMetadata::SecurityStatus PluginMetadata::GetSecurityStatus(
   return it->second;
 }
 
-bool PluginMetadata::VersionComparator::operator() (const Version& lhs,
-                                                    const Version& rhs) const {
+bool PluginMetadata::VersionComparator::operator() (
+    const base::Version& lhs, const base::Version& rhs) const {
   // Keep versions ordered by newest (biggest) first.
   return lhs.CompareTo(rhs) > 0;
 }