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

ios/chrome/browser/metrics/ios_chrome_metrics_service_accessor_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 "ios/chrome/browser/metrics/ios_chrome_metrics_service_accessor.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/macros.h"
+#include "base/prefs/pref_registry_simple.h"
+#include "base/prefs/testing_pref_service.h"
 #include "components/metrics/metrics_pref_names.h"
-#include "components/prefs/pref_registry_simple.h"
-#include "components/prefs/testing_pref_service.h"
 #include "ios/chrome/test/ios_chrome_scoped_testing_local_state.h"
 #include "ios/chrome/test/testing_application_context.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class IOSChromeMetricsServiceAccessorTest : public testing::Test {
  public:
   IOSChromeMetricsServiceAccessorTest() {}
 
   PrefService* GetLocalState() { return local_state_.Get(); }
 
@@ skipping 26 matching lines @@
       IOSChromeMetricsServiceAccessor::IsMetricsAndCrashReportingEnabled());
   GetLocalState()->SetBoolean(pref, true);
   EXPECT_FALSE(
       IOSChromeMetricsServiceAccessor::IsMetricsAndCrashReportingEnabled());
 #else
   // Metrics Reporting is never enabled when GOOGLE_CHROME_BUILD is undefined.
   EXPECT_FALSE(
       IOSChromeMetricsServiceAccessor::IsMetricsAndCrashReportingEnabled());
 #endif
 }