Field trial removing tiles from NTP if URL is already open - for 1993 clients

chrome/browser/history/top_sites.cc

 // Copyright (c) 2013 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/history/top_sites.h"
 
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_util.h"
 #include "chrome/browser/history/top_sites_impl.h"
 #include "chrome/browser/history/top_sites_likely_impl.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "grit/locale_settings.h"
 #include "grit/theme_resources.h"
 
 namespace history {
 
-namespace {
-
-// Constants for the most visited tile placement field trial.
-// ex:
-// "OneEightGroup_Flipped" --> Will cause tile 1 and 8 to be flipped.
-// "OneEightGroup_NoChange" --> Will not flip anything.
-//
-// See field trial config (MostVisitedTilePlacement.json) for details.
-const char kMostVisitedFieldTrialName[] = "MostVisitedTilePlacement";
-const char kOneEightGroupPrefix[] = "OneEight";
-const char kOneFourGroupPrefix[] = "OneFour";
-const char kFlippedSuffix[] = "Flipped";
-
-}  // namespace
-
 const TopSites::PrepopulatedPage kPrepopulatedPages[] = {
 #if defined(OS_ANDROID)
     { IDS_MOBILE_WELCOME_URL, IDS_NEW_TAB_CHROME_WELCOME_PAGE_TITLE,
     IDR_PRODUCT_LOGO_16, IDR_NEWTAB_CHROME_WELCOME_PAGE_THUMBNAIL,
     SkColorSetRGB(0, 147, 60) }
 #else
   { IDS_CHROME_WELCOME_URL, IDS_NEW_TAB_CHROME_WELCOME_PAGE_TITLE,
     IDR_PRODUCT_LOGO_16, IDR_NEWTAB_CHROME_WELCOME_PAGE_THUMBNAIL,
     SkColorSetRGB(0, 147, 60) },
 #endif
@@ skipping 10 matching lines @@
     // Experimental group. Enabled through a command-line flag.
     TopSitesLikelyImpl* top_sites_likely_impl = new TopSitesLikelyImpl(profile);
     top_sites_likely_impl->Init(db_name);
     return top_sites_likely_impl;
   }
   TopSitesImpl* top_sites_impl = new TopSitesImpl(profile);
   top_sites_impl->Init(db_name);
   return top_sites_impl;
 }
 
-// static
-void TopSites::MaybeShuffle(MostVisitedURLList* data) {
-  const std::string group_name =
-      base::FieldTrialList::FindFullName(kMostVisitedFieldTrialName);
-
-  // Depending on the study group of the client, we might flip the 1st and 4th
-  // tiles, or the 1st and 8th, or do nothing.
-  if (EndsWith(group_name, kFlippedSuffix, true)) {
-    size_t index_to_flip = 0;
-    if (StartsWithASCII(group_name, kOneEightGroupPrefix, true) &&
-        data->size() >= 8) {
-      index_to_flip = 7;
-    } else if (StartsWithASCII(group_name, kOneFourGroupPrefix, true) &&
-               data->size() >= 4) {
-      index_to_flip = 3;
-    }
-
-    if (data->empty() || (*data)[index_to_flip].url.is_empty())
-      return;
-    std::swap((*data)[0], (*data)[index_to_flip]);
-  }
-}
-
 }  // namespace history