Factoring GUID generation from metrics to base

chrome/browser/metrics/metrics_service.h

 // Copyright (c) 2010 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.
 
 // This file defines a service that collects information about the user
 // experience in order to help improve future versions of the app.
 
 #ifndef CHROME_BROWSER_METRICS_METRICS_SERVICE_H_
 #define CHROME_BROWSER_METRICS_METRICS_SERVICE_H_
 #pragma once
@@ skipping 174 matching lines @@
   // idle_since_last_transmission to false and starts the timer (provided
   // starting the timer is permitted).
   void HandleIdleSinceLastTransmission(bool in_idle);
 
   // Set up client ID, session ID, etc.
   void InitializeMetricsState();
 
   // Generates a new client ID to use to identify self to metrics server.
   static std::string GenerateClientID();
 
-#if defined(OS_POSIX)
-  // Generates a new client ID to use to identify self to metrics server,
-  // given 128 bits of randomness.
-  static std::string RandomBytesToGUIDString(const uint64 bytes[2]);
-#endif
-
   // Schedule the next save of LocalState information.  This is called
   // automatically by the task that performs each save to schedule the next one.
   void ScheduleNextStateSave();
 
   // Save the LocalState information immediately. This should not be called by
   // anybody other than the scheduler to avoid doing too many writes. When you
   // make a change, call ScheduleNextStateSave() instead.
   void SaveLocalState();
 
   // Called to start recording user experience metrics.
@@ skipping 287 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, CorruptSizeOfLogList);
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, CorruptChecksumOfLogList);
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, ClientIdGeneratesAllZeroes);
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, ClientIdGeneratesCorrectly);
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, ClientIdCorrectlyFormatted);
 
   DISALLOW_COPY_AND_ASSIGN(MetricsService);
 };
 
 #endif  // CHROME_BROWSER_METRICS_METRICS_SERVICE_H_