Cast: Added missing DCHECKs to ThreadChecker calls and minor cleanup.

media/cast/logging/simple_event_subscriber.cc

Index: media/cast/logging/simple_event_subscriber.cc
diff --git a/media/cast/logging/simple_event_subscriber.cc b/media/cast/logging/simple_event_subscriber.cc
index f0b2250fcce6d73215053826c43b810167ceab82..78f932d1e0ed7c810445c9174ca9f9238198063b 100644
--- a/media/cast/logging/simple_event_subscriber.cc
+++ b/media/cast/logging/simple_event_subscriber.cc
@@ -7,53 +7,50 @@
 #include <vector>
 
 #include "base/logging.h"
-#include "base/single_thread_task_runner.h"
 
 namespace media {
 namespace cast {
 
-SimpleEventSubscriber::SimpleEventSubscriber(
-    const scoped_refptr<base::SingleThreadTaskRunner>& main_thread_proxy) {
-  DCHECK(main_thread_proxy->RunsTasksOnCurrentThread());
-}
+SimpleEventSubscriber::SimpleEventSubscriber() {}
 
 SimpleEventSubscriber::~SimpleEventSubscriber() {
-  thread_checker_.CalledOnValidThread();
+  DCHECK(thread_checker_.CalledOnValidThread());
 }
 
 void SimpleEventSubscriber::OnReceiveFrameEvent(const FrameEvent& frame_event) {
-  thread_checker_.CalledOnValidThread();
+  DCHECK(thread_checker_.CalledOnValidThread());
   frame_events_.push_back(frame_event);
 }
 
 void SimpleEventSubscriber::OnReceivePacketEvent(
     const PacketEvent& packet_event) {
-  thread_checker_.CalledOnValidThread();
+  DCHECK(thread_checker_.CalledOnValidThread());
   packet_events_.push_back(packet_event);
 }
 
 void SimpleEventSubscriber::OnReceiveGenericEvent(
     const GenericEvent& generic_event) {
+  DCHECK(thread_checker_.CalledOnValidThread());
   generic_events_.push_back(generic_event);
 }
 
 void SimpleEventSubscriber::GetFrameEventsAndReset(
     std::vector<FrameEvent>* frame_events) {
-  thread_checker_.CalledOnValidThread();
+  DCHECK(thread_checker_.CalledOnValidThread());
   frame_events->swap(frame_events_);
   frame_events_.clear();
 }
 
 void SimpleEventSubscriber::GetPacketEventsAndReset(
     std::vector<PacketEvent>* packet_events) {
-  thread_checker_.CalledOnValidThread();
+  DCHECK(thread_checker_.CalledOnValidThread());
   packet_events->swap(packet_events_);
   packet_events_.clear();
 }
 
 void SimpleEventSubscriber::GetGenericEventsAndReset(
     std::vector<GenericEvent>* generic_events) {
-  thread_checker_.CalledOnValidThread();
+  DCHECK(thread_checker_.CalledOnValidThread());
   generic_events->swap(generic_events_);
   generic_events_.clear();
 }