Revert of Delete base/prefs and update callers to use components.

components/metrics/daily_event_unittest.cc

 // Copyright 2014 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/metrics/daily_event.h"
 
 #include "base/macros.h"
-#include "components/prefs/testing_pref_service.h"
+#include "base/prefs/testing_pref_service.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace metrics {
 
 namespace {
 
 const char kTestPrefName[] = "TestPref";
 const char kTestMetricName[] = "TestMetric";
 
 class TestDailyObserver : public DailyEvent::Observer {
@@ skipping 66 matching lines @@
 
 // The event should not fire if the preference is less than a day in the future.
 TEST_F(DailyEventTest, TestSoonNotFired) {
   base::Time last_time = base::Time::Now() + base::TimeDelta::FromMinutes(2);
   prefs_.SetInt64(kTestPrefName, last_time.ToInternalValue());
   event_.CheckInterval();
   EXPECT_FALSE(observer_->fired());
 }
 
 }  // namespace metrics