Revert "Update all users of base::Version to explicitly specify the namespace, and clean up the hea…

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index fdfde83b5e8854ce17d06140c17c67ea4beb3937..7eff5d92727cc9c9f3dfd1078051614d8637bcbd 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -1827,7 +1827,7 @@ void ExtensionService::AddExtension(const Extension* extension) {
 void ExtensionService::AddComponentExtension(const Extension* extension) {
   const std::string old_version_string(
       extension_prefs_->GetVersionString(extension->id()));
-  const base::Version old_version(old_version_string);
+  const Version old_version(old_version_string);
 
   VLOG(1) << "AddComponentExtension " << extension->name();
   if (!old_version.IsValid() || !old_version.Equals(*extension->version())) {
@@ -2003,7 +2003,7 @@ ExtensionService::ImportStatus ExtensionService::CheckImports(
         SharedModuleInfo::GetImports(extension);
     std::vector<SharedModuleInfo::ImportInfo>::const_iterator i;
     for (i = imports.begin(); i != imports.end(); ++i) {
-      base::Version version_required(i->minimum_version);
+      Version version_required(i->minimum_version);
       const Extension* imported_module =
           GetExtensionById(i->extension_id, true);
       if (!imported_module) {
@@ -2400,7 +2400,7 @@ bool ExtensionService::ShouldBlockUrlInBrowserTab(GURL* url) {
 
 bool ExtensionService::OnExternalExtensionFileFound(
          const std::string& id,
-         const base::Version* version,
+         const Version* version,
          const base::FilePath& path,
          Manifest::Location location,
          int creation_flags,