Fix memory leak introduced by r22043.

chrome/browser/extensions/extensions_service.cc

Index: chrome/browser/extensions/extensions_service.cc
diff --git a/chrome/browser/extensions/extensions_service.cc b/chrome/browser/extensions/extensions_service.cc
index bf657c7fcce0be8696dc6fe40c1f3017e57180a9..cebb46a3d438bcf5a8900d4ec7b82636d3fa7304 100644
--- a/chrome/browser/extensions/extensions_service.cc
+++ b/chrome/browser/extensions/extensions_service.cc
@@ -369,9 +369,9 @@ void ExtensionsService::OnExternalExtensionFound(const std::string& id,
   // version. This is important because these extensions are going to get
   // installed on every startup.
   Extension* existing = GetExtensionById(id);
+  scoped_ptr<Version> other(Version::GetVersionFromString(version));
   if (existing) {
-    switch (existing->version()->CompareTo(
-                *Version::GetVersionFromString(version))) {
+    switch (existing->version()->CompareTo(*other)) {
       case -1:  // existing version is older, we should upgrade
         break;
       case 0:  // existing version is same, do nothing