Revert of Straightens outs DEPS in mojo/common

mojo/common/time_helper.h

Index: mojo/common/time_helper.h
diff --git a/mojo/common/time_helper.h b/mojo/common/time_helper.h
new file mode 100644
index 0000000000000000000000000000000000000000..365ae04993bde177222ee2f90ef89ed99e85c936
--- /dev/null
+++ b/mojo/common/time_helper.h
@@ -0,0 +1,34 @@
+// 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.
+
+#ifndef MOJO_COMMON_TIME_HELPER_H_
+#define MOJO_COMMON_TIME_HELPER_H_
+
+#include "base/time/time.h"
+#include "mojo/common/mojo_common_export.h"
+
+namespace base {
+class TickClock;
+}
+
+namespace mojo {
+namespace common {
+namespace test {
+
+// Sets the TickClock used for getting TimeTicks::Now(). This is currently used
+// by both HandleWatcher and MessagePumpMojo.
+MOJO_COMMON_EXPORT void SetTickClockForTest(base::TickClock* clock);
+
+}  // namespace test
+
+namespace internal {
+
+// Returns now. Used internally; generally not useful.
+MOJO_COMMON_EXPORT base::TimeTicks NowTicks();
+
+}  // namespace internal
+}  // namespace common
+}  // namespace mojo
+
+#endif  // MOJO_COMMON_TIME_HELPER_H_