Revert of Straightens outs DEPS in mojo/common

mojo/common/time_helper.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 "mojo/common/time_helper.h"
+
+#include "base/time/tick_clock.h"
+
+namespace mojo {
+namespace common {
+
+namespace {
+
+base::TickClock* tick_clock = NULL;
+
+}  // namespace
+
+namespace test {
+
+void SetTickClockForTest(base::TickClock* clock) {
+  tick_clock = clock;
+}
+}  // namespace test
+
+namespace internal {
+
+base::TimeTicks NowTicks() {
+  return tick_clock ? tick_clock->NowTicks() : base::TimeTicks::Now();
+}
+
+}  // namespace internal
+}  // namespace common
+}  // namespace mojo