[Autofill] Remove direct use of base::Time::Now() in Autofill

components/autofill/core/common/autofill_clock.cc

+// Copyright 2017 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/autofill/core/common/autofill_clock.h"
+
+#include <utility>
+
+#include "base/time/clock.h"
+#include "base/time/default_clock.h"
+
+namespace autofill {
+
+namespace {
+
+static base::LazyInstance<AutofillClock> g_autofill_clock =
+    LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+// static
+base::Time AutofillClock::Now() {
+  if (!g_autofill_clock.Get().clock_)
+    SetClock();
+
+  return g_autofill_clock.Get().clock_->Now();
+}
+
+AutofillClock::AutofillClock(){};
+AutofillClock::~AutofillClock(){};
+
+// static
+void AutofillClock::SetClock() {
+  g_autofill_clock.Get().clock_.reset(new base::DefaultClock());
+}
+
+// static
+void AutofillClock::SetTestClock(std::unique_ptr<base::Clock> clock) {

[Roger McFarlane (Chromium), 2017/02/01 15:34:26]

DCHECK(clock != nullptr)
?

[sebsg, 2017/02/01 18:25:57]

Done.

+  g_autofill_clock.Get().clock_ = std::move(clock);
+}
+
+}  // namespace autofill