Reverting based on discussions on #chromium with shess and rsleevi

chrome/browser/history/history_field_trial.cc

-// Copyright (c) 2011 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/history_field_trial.h"
-
-#include "base/metrics/field_trial.h"
-
-namespace history {
-
-namespace {
-
-int g_low_mem_trial_group = 0;
-bool g_low_mem_trial = false;
-
-static const char kHistoryFieldTrialName[] = "History";
-
-}  // namespace
-
-// static
-void HistoryFieldTrial::Activate() {
-  if (g_low_mem_trial_group)
-    return;  // Already initialized.
-
-  scoped_refptr<base::FieldTrial> trial(new base::FieldTrial(
-      kHistoryFieldTrialName, 1000, "Inactive", 2012, 2, 1));
-
-  g_low_mem_trial_group = trial->AppendGroup("LowMem", 50);  // 5%
-  if (trial->group() == g_low_mem_trial_group)
-    g_low_mem_trial = true;
-}
-
-// static
-bool HistoryFieldTrial::IsLowMemFieldTrial() {
-  return g_low_mem_trial;
-}
-
-// static
-std::string HistoryFieldTrial::GetGroupSuffix() {
-  return g_low_mem_trial ? std::string("_LowMem") : std::string();
-}
-
-}  // namespace history