Connect SparseHistogram with the rest of stats system

dbus/signal_sender_verification_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 "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/histogram_samples.h"
 #include "base/metrics/statistics_recorder.h"
@@ skipping 164 matching lines @@
   test_service_->SendTestSignal(kMessage);
   // Receive the signal with the object proxy. The signal is handled in
   // SignalSenderVerificationTest::OnTestSignal() in the main thread.
   WaitForTestSignal();
   ASSERT_EQ(kMessage, test_signal_string_);
 }
 
 TEST_F(SignalSenderVerificationTest, TestSignalRejected) {
   // To make sure the histogram instance is created.
   UMA_HISTOGRAM_COUNTS("DBus.RejectedSignalCount", 0);
-  base::Histogram* reject_signal_histogram =
+  base::HistogramBase* reject_signal_histogram =
         base::StatisticsRecorder::FindHistogram("DBus.RejectedSignalCount");
   scoped_ptr<base::HistogramSamples> samples1(
       reject_signal_histogram->SnapshotSamples());
 
   const char kNewMessage[] = "hello, new world";
   test_service2_->SendTestSignal(kNewMessage);
 
   // This test tests that our callback is NOT called by the ObjectProxy.
   // Sleep to have message delivered to the client via the D-Bus service.
   base::PlatformThread::Sleep(TestTimeouts::action_timeout());
@@ skipping 108 matching lines @@
   // latest_name_owner_ becomes non empty as the new owner appears.
   ASSERT_FALSE(latest_name_owner_.empty());
 
   // Now the second service owns the name.
   const char kNewMessage[] = "hello, new world";
 
   test_service2_->SendTestSignal(kNewMessage);
   WaitForTestSignal();
   ASSERT_EQ(kNewMessage, test_signal_string_);
 }