Move StatisticsRecorder out of histogram.cc/h for further refactoring.

chrome/browser/net/http_pipelining_compatibility_client_unittest.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 "chrome/browser/net/http_pipelining_compatibility_client.h"
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
+#include "base/metrics/statistics_recorder.h"
 #include "base/stl_util.h"
 #include "base/stringprintf.h"
 #include "content/public/test/test_browser_thread.h"
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "net/url_request/url_request_test_util.h"
 #include "net/test/test_server.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 529 matching lines @@
   callback.WaitForResult();
 
   ExpectHistogramCount(1, false, FIELD_CANARY);
   ExpectHistogramCount(0, false, FIELD_SUCCESS);
   ExpectHistogramCount(0, true, FIELD_SUCCESS);
 }
 
 }  // anonymous namespace
 
 }  // namespace chrome_browser_net