Enable the VariationsService on official builds when --variations-service-url is provided.

chrome/browser/metrics/variations/variations_service.cc

Index: chrome/browser/metrics/variations/variations_service.cc
diff --git a/chrome/browser/metrics/variations/variations_service.cc b/chrome/browser/metrics/variations/variations_service.cc
index b4e12da5b1bb716dbe4b3ddb0f88b9d6b3ae6461..6e9b6e72c655741ddb2ab1ef67c5a1ed9d188a7c 100644
--- a/chrome/browser/metrics/variations/variations_service.cc
+++ b/chrome/browser/metrics/variations/variations_service.cc
@@ -159,6 +159,10 @@ void VariationsService::StartRepeatedVariationsSeedFetch() {
                this, &VariationsService::FetchVariationsSeed);
 }
 
+void VariationsService::SetCreateTrialsFromSeedCalledForTesting(bool called) {
+  create_trials_from_seed_called_ = called;
+}
+
 // static
 void VariationsService::RegisterPrefs(PrefServiceSimple* prefs) {
   prefs->RegisterStringPref(prefs::kVariationsSeed, std::string());
@@ -166,8 +170,16 @@ void VariationsService::RegisterPrefs(PrefServiceSimple* prefs) {
                            base::Time().ToInternalValue());
 }
 
-void VariationsService::SetCreateTrialsFromSeedCalledForTesting(bool called) {
-  create_trials_from_seed_called_ = called;
+// static
+VariationsService* VariationsService::Create() {
+#if defined(GOOGLE_CHROME_BUILD) && !defined(OS_ANDROID)

[Alexei Svitkine (slow), 2013/01/03 20:14:06]

Do we have a bug tracking the !ANDROID part? If so, we should put a link to it
here, in a comment.

[SteveT, 2013/01/03 20:35:42]

Done.

+  // Unless the URL was provided, unsupported builds should return NULL to

[Alexei Svitkine (slow), 2013/01/03 20:14:06]

I think "unofficial" is the correct term.

[SteveT, 2013/01/03 20:35:42]

So I originally used unofficial, but I changed the wording to "supported" since
the condition covers official & !android. Think I should change it back?

[Alexei Svitkine (slow), 2013/01/03 20:40:42]

Ah, makes sense. OK.

+  // indicate that the service should not be used.
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kVariationsServerURL))
+    return NULL;
+#endif
+  return new VariationsService;
 }
 
 void VariationsService::DoActualFetch() {