Consistently use namespaced base::Version in extensions code.

chrome/browser/extensions/api/runtime/chrome_runtime_api_delegate.cc

Index: chrome/browser/extensions/api/runtime/chrome_runtime_api_delegate.cc
diff --git a/chrome/browser/extensions/api/runtime/chrome_runtime_api_delegate.cc b/chrome/browser/extensions/api/runtime/chrome_runtime_api_delegate.cc
index 3e2e73453c77d943761a205728753fe04a2c510a..3d73adf66e0175390fa881e049e4fd5fb8550430 100644
--- a/chrome/browser/extensions/api/runtime/chrome_runtime_api_delegate.cc
+++ b/chrome/browser/extensions/api/runtime/chrome_runtime_api_delegate.cc
@@ -337,9 +337,10 @@ void ChromeRuntimeAPIDelegate::Observe(
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   DCHECK_EQ(extensions::NOTIFICATION_EXTENSION_UPDATE_FOUND, type);
-  using UpdateDetails = const std::pair<std::string, Version>;
+  using UpdateDetails = const std::pair<std::string, base::Version>;
   const std::string& id = content::Details<UpdateDetails>(details)->first;
-  const Version& version = content::Details<UpdateDetails>(details)->second;
+  const base::Version& version =
+      content::Details<UpdateDetails>(details)->second;
   if (version.IsValid()) {
     CallUpdateCallbacks(
         id, UpdateCheckResult(true, kUpdateFound, version.GetString()));