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

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/api/metrics_private/metrics_private_api.h"
 
 #include <algorithm>
 
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
@@ skipping 41 matching lines @@
   SetResult(new base::StringValue(base::FieldTrialList::FindFullName(name)));
   return true;
 }
 
 bool MetricsPrivateGetVariationParamsFunction::RunSync() {
   scoped_ptr<GetVariationParams::Params> params(
       GetVariationParams::Params::Create(*args_));
   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;
 }
 
 bool MetricsPrivateRecordUserActionFunction::RunSync() {
   scoped_ptr<RecordUserAction::Params> params(
       RecordUserAction::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
 
   content::RecordComputedAction(params->name);
   return true;
@@ skipping 111 matching lines @@
 bool MetricsPrivateRecordLongTimeFunction::RunSync() {
   scoped_ptr<RecordLongTime::Params> params(
       RecordLongTime::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
   static const int kOneHourMs = 60 * 60 * 1000;
   return RecordValue(params->metric_name, base::HISTOGRAM,
                      1, kOneHourMs, 50, params->value);
 }
 
 } // namespace extensions