Preset variation parameters for NTPSnippets feature.

components/ntp_snippets/ntp_snippets_fetcher.cc

 // Copyright 2016 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 "components/ntp_snippets/ntp_snippets_fetcher.h"
 
 #include <stdlib.h>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 155 matching lines @@
   } else {
     personalization_ = Personalization::kBoth;
     LOG_IF(WARNING, !personalization.empty() &&
                         personalization != kPersonalizationBothString)
         << "Unknown value for " << kPersonalizationName << ": "
         << personalization;
   }
 
   std::string host_restriction = variations::GetVariationParamValue(
       ntp_snippets::kStudyName, kHostRestrictionName);
-  if (host_restriction == kHostRestrictionOffString) {
+  if (host_restriction == kHostRestrictionOnString) {
+    use_host_restriction_ = true;
+  } else {
     use_host_restriction_ = false;
-  } else {
-    use_host_restriction_ = true;
     LOG_IF(WARNING, !host_restriction.empty() &&
-                        host_restriction != kHostRestrictionOnString)
+                        host_restriction != kHostRestrictionOffString)
         << "Unknown value for " << kHostRestrictionName << ": "
         << host_restriction;
   }
 }
 
 NTPSnippetsFetcher::~NTPSnippetsFetcher() {
   if (waiting_for_refresh_token_)
     token_service_->RemoveObserver(this);
 }
 
@@ skipping 241 matching lines @@
                       tick_clock_->NowTicks() - fetch_start_time_);
   UMA_HISTOGRAM_ENUMERATION("NewTabPage.Snippets.FetchResult",
                             static_cast<int>(result),
                             static_cast<int>(FetchResult::RESULT_MAX));
 
   if (!snippets_available_callback_.is_null())
     snippets_available_callback_.Run(std::move(snippets));
 }
 
 }  // namespace ntp_snippets