Disallow non-namespaced use of base::Version.

chrome/renderer/media/chrome_key_systems.cc

Index: chrome/renderer/media/chrome_key_systems.cc
diff --git a/chrome/renderer/media/chrome_key_systems.cc b/chrome/renderer/media/chrome_key_systems.cc
index 4c02dfef7c97eda34796c3a5912198881f8c843f..6ea5d0d25c15047c4075c91f0b06d42856cc03e1 100644
--- a/chrome/renderer/media/chrome_key_systems.cc
+++ b/chrome/renderer/media/chrome_key_systems.cc
@@ -213,7 +213,7 @@ void GetSupportedCodecsForPepperCdm(
 static void AddPepperBasedWidevine(
     std::vector<std::unique_ptr<KeySystemProperties>>* concrete_key_systems) {
 #if defined(WIDEVINE_CDM_MIN_GLIBC_VERSION)
-  Version glibc_version(gnu_get_libc_version());
+  base::Version glibc_version(gnu_get_libc_version());
   DCHECK(glibc_version.IsValid());
   if (glibc_version < base::Version(WIDEVINE_CDM_MIN_GLIBC_VERSION))
     return;