Update all users of base::Version to explicitly specify the namespace, and clean up the header.

chrome/browser/component_updater/crx_update_item.h

Index: chrome/browser/component_updater/crx_update_item.h
diff --git a/chrome/browser/component_updater/crx_update_item.h b/chrome/browser/component_updater/crx_update_item.h
index 477da9ab73376bb0c3605593b3dfe26f2ceb61b2..be79e483b33b7deeb2894fce9ea3f0f0fb6c28de 100644
--- a/chrome/browser/component_updater/crx_update_item.h
+++ b/chrome/browser/component_updater/crx_update_item.h
@@ -84,8 +84,8 @@ struct CrxUpdateItem {
   std::vector<GURL> crx_diffurls;
 
   // The from/to version and fingerprint values.
-  Version previous_version;
-  Version next_version;
+  base::Version previous_version;
+  base::Version next_version;
   std::string previous_fp;
   std::string next_fp;