Don't log error from metricsPrivate API when GetVariationParams fails to find a

chrome/browser/extensions/api/metrics_private/metrics_private_api.cc

Index: chrome/browser/extensions/api/metrics_private/metrics_private_api.cc
diff --git a/chrome/browser/extensions/api/metrics_private/metrics_private_api.cc b/chrome/browser/extensions/api/metrics_private/metrics_private_api.cc
index 0b344442580e4bc321f4dc996a41131c8b9a4a20..66d4ee98cfbe235e0eb7134820cc4a476c3c5d05 100644
--- a/chrome/browser/extensions/api/metrics_private/metrics_private_api.cc
+++ b/chrome/browser/extensions/api/metrics_private/metrics_private_api.cc
@@ -59,13 +59,10 @@ bool MetricsPrivateGetVariationParamsFunction::RunSync() {
   EXTENSION_FUNCTION_VALIDATE(params.get());
 
   GetVariationParams::Results::Params result;
-  if (!chrome_variations::GetVariationParams(
+  if (chrome_variations::GetVariationParams(
       params->name, &result.additional_properties)) {
-    SetError("Variation parameters are unavailable.");
-    return false;
+    SetResult(result.ToValue().release());
   }
-
-  SetResult(result.ToValue().release());
   return true;
 }