Consistently use namespaced base::Version in extensions code.

extensions/browser/updater/update_service.cc

Index: extensions/browser/updater/update_service.cc
diff --git a/extensions/browser/updater/update_service.cc b/extensions/browser/updater/update_service.cc
index 64bdae17a5780e55e79a83ce0b4cb22ba75fac7b..dc211a624950b3624c7cf314bba09aefa205a0e5 100644
--- a/extensions/browser/updater/update_service.cc
+++ b/extensions/browser/updater/update_service.cc
@@ -43,7 +43,7 @@ void UpdateService::Shutdown() {
 }
 
 void UpdateService::SendUninstallPing(const std::string& id,
-                                      const Version& version,
+                                      const base::Version& version,
                                       int reason) {
   update_client_->SendUninstallPing(id, version, reason);
 }