Move browsing data counters helper functions to an 'utils' file.

chrome/browser/browsing_data/browsing_data_counter_utils.h

+// Copyright 2015 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.
+
+#ifndef CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_COUNTER_UTILS_H_
+#define CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_COUNTER_UTILS_H_
+
+#include "base/strings/string16.h"
+#include "chrome/browser/browsing_data/browsing_data_counter.h"
+
+// Whether the browsing data counters experiment is enabled.
+bool AreCountersEnabled();
+
+// Constructs the text to be displayed by a counter from the given |result|.
+base::string16 GetCounterTextFromResult(
+    const BrowsingDataCounter::Result* result);
+
+// Creates a new instance of BrowsingDataCounter that is counting the data
+// related to a given deletion preference |pref_name|.
+BrowsingDataCounter* CreateCounterForPreference(std::string pref_name);
+
+#endif  // CHROME_BROWSER_BROWSING_DATA_BROWSING_DATA_COUNTER_UTILS_H_