Convert media constants to constexpr.

chromecast/media/cma/base/buffering_controller.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 "chromecast/media/cma/base/buffering_controller.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "chromecast/base/metrics/cast_metrics_helper.h"
@@ skipping 79 matching lines @@
 }
 
 void BufferingController::SetMediaTime(base::TimeDelta time) {
   for (StreamList::iterator it = stream_list_.begin();
        it != stream_list_.end(); ++it) {
     (*it)->SetMediaTime(time);
   }
 }
 
 base::TimeDelta BufferingController::GetMaxRenderingTime() const {
-  base::TimeDelta max_rendering_time(::media::kNoTimestamp());
+  base::TimeDelta max_rendering_time(::media::kNoTimestamp);
   for (StreamList::const_iterator it = stream_list_.begin();
        it != stream_list_.end(); ++it) {
     base::TimeDelta max_stream_rendering_time =
         (*it)->GetMaxRenderingTime();
-    if (max_stream_rendering_time == ::media::kNoTimestamp())
-      return ::media::kNoTimestamp();
-    if (max_rendering_time == ::media::kNoTimestamp() ||
+    if (max_stream_rendering_time == ::media::kNoTimestamp)
+      return ::media::kNoTimestamp;
+    if (max_rendering_time == ::media::kNoTimestamp ||
         max_stream_rendering_time < max_rendering_time) {
       max_rendering_time = max_stream_rendering_time;
     }
   }
   return max_rendering_time;
 }
 
 void BufferingController::Reset() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
@@ skipping 99 matching lines @@
 
 void BufferingController::DumpState() const {
   for (StreamList::const_iterator it = stream_list_.begin();
        it != stream_list_.end(); ++it) {
     CMALOG(kLogControl) << (*it)->ToString();
   }
 }
 
 }  // namespace media
 }  // namespace chromecast