Fix memory leak introduced by r22043.

BUG=18070
TEST=none

Review URL: http://codereview.chromium.org/160509

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@22367 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/extensions_service.cc b/chrome/browser/extensions/extensions_service.cc
index 7f2eb05..fe04e779e8 100644
--- a/chrome/browser/extensions/extensions_service.cc
+++ b/chrome/browser/extensions/extensions_service.cc
@@ -370,9 +370,9 @@
   // 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