Make chrome/browser/extensions use base::Clock instead of MockTimeProvider

base/test/simple_test_clock.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/test/simple_test_clock.h"
 
 namespace base {
 
 SimpleTestClock::SimpleTestClock() {}
 
 SimpleTestClock::~SimpleTestClock() {}
 
 Time SimpleTestClock::Now() {
   AutoLock lock(lock_);
   return now_;
 }
 
 void SimpleTestClock::Advance(TimeDelta delta) {
   AutoLock lock(lock_);
   now_ += delta;
 }
 
+void SimpleTestClock::SetNow(Time now) {
+  AutoLock lock(lock_);
+  now_ = now;
+}
+
 }  // namespace base