[sync] Enable sync credential caching by default for post-M22 builds

chrome/browser/sync/credential_cache_service_factory_win.cc

Index: chrome/browser/sync/credential_cache_service_factory_win.cc
diff --git a/chrome/browser/sync/credential_cache_service_factory_win.cc b/chrome/browser/sync/credential_cache_service_factory_win.cc
index a66c72b4ad169498d3da5ab47160f9e38589b70d..1732ec597bd0546a6b118291615918b8849e262f 100644
--- a/chrome/browser/sync/credential_cache_service_factory_win.cc
+++ b/chrome/browser/sync/credential_cache_service_factory_win.cc
@@ -61,11 +61,11 @@ bool CredentialCacheServiceFactory::ServiceIsCreatedWithProfile() {
 ProfileKeyedService* CredentialCacheServiceFactory::BuildServiceInstanceFor(
     Profile* profile) const {
   // Only instantiate a CredentialCacheService object if we are running in the
-  // default profile on Windows 8, and if credential caching is enabled.
+  // default profile on Windows 8, and if credential caching is not disabled.
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
   if (base::win::GetVersion() >= base::win::VERSION_WIN8 &&
       IsDefaultProfile(profile) &&
-      command_line->HasSwitch(switches::kEnableSyncCredentialCaching)) {
+      !command_line->HasSwitch(switches::kDisableSyncCredentialCaching)) {
     return new syncer::CredentialCacheService(profile);
   }
   return NULL;