Revert of Add PrefStore::GetValues

components/prefs/json_pref_store.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 "components/prefs/json_pref_store.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <utility>
@@ skipping 172 matching lines @@
 
   base::Value* tmp = nullptr;
   if (!prefs_->Get(key, &tmp))
     return false;
 
   if (result)
     *result = tmp;
   return true;
 }
 
-std::unique_ptr<base::DictionaryValue> JsonPrefStore::GetValues() const {
-  return prefs_->CreateDeepCopy();
-}
-
 void JsonPrefStore::AddObserver(PrefStore::Observer* observer) {
   DCHECK(CalledOnValidThread());
 
   observers_.AddObserver(observer);
 }
 
 void JsonPrefStore::RemoveObserver(PrefStore::Observer* observer) {
   DCHECK(CalledOnValidThread());
 
   observers_.RemoveObserver(observer);
@@ skipping 396 matching lines @@
   DCHECK_EQ(31, num_buckets);
 
   // The histogram below is an expansion of the UMA_HISTOGRAM_CUSTOM_COUNTS
   // macro adapted to allow for a dynamically suffixed histogram name.
   // Note: The factory creates and owns the histogram.
   base::HistogramBase* histogram = base::Histogram::FactoryGet(
       histogram_name, min_value, max_value, num_buckets,
       base::HistogramBase::kUmaTargetedHistogramFlag);
   return histogram;
 }