Migrate ArcBridgeService::Observer and ArcSession::Observer.

components/arc/arc_bridge_service.cc

Index: components/arc/arc_bridge_service.cc
diff --git a/components/arc/arc_bridge_service.cc b/components/arc/arc_bridge_service.cc
index b9b5d92567f4403bc6aab53dc09e6e1542e90244..73c96d862789f0e47385f3f2760037f3f422c445 100644
--- a/components/arc/arc_bridge_service.cc
+++ b/components/arc/arc_bridge_service.cc
@@ -23,7 +23,7 @@ const base::Feature kArcEnabledFeature{"EnableARC",
 
 ArcBridgeService::ArcBridgeService()
     : state_(State::STOPPED),
-      stop_reason_(StopReason::SHUTDOWN),
+      stop_reason_(ArcSessionObserver::StopReason::SHUTDOWN),
       weak_factory_(this) {}
 
 ArcBridgeService::~ArcBridgeService() {
@@ -55,12 +55,12 @@ void ArcBridgeService::OnShutdown() {
   NOTREACHED();
 }
 
-void ArcBridgeService::AddObserver(Observer* observer) {
+void ArcBridgeService::AddObserver(ArcSessionObserver* observer) {
   DCHECK(CalledOnValidThread());
   observer_list_.AddObserver(observer);
 }
 
-void ArcBridgeService::RemoveObserver(Observer* observer) {
+void ArcBridgeService::RemoveObserver(ArcSessionObserver* observer) {
   DCHECK(CalledOnValidThread());
   observer_list_.RemoveObserver(observer);
 }
@@ -72,14 +72,15 @@ void ArcBridgeService::SetState(State state) {
   VLOG(2) << "State: " << static_cast<uint32_t>(state_);
   if (state_ == State::READY) {
     for (auto& observer : observer_list())
-      observer.OnBridgeReady();
+      observer.OnSessionReady();
   } else if (state == State::STOPPED) {
     for (auto& observer : observer_list())
-      observer.OnBridgeStopped(stop_reason_);
+      observer.OnSessionStopped(stop_reason_);
   }
 }
 
-void ArcBridgeService::SetStopReason(StopReason stop_reason) {
+void ArcBridgeService::SetStopReason(
+    ArcSessionObserver::StopReason stop_reason) {
   DCHECK(CalledOnValidThread());
   stop_reason_ = stop_reason;
 }
@@ -88,22 +89,4 @@ bool ArcBridgeService::CalledOnValidThread() {
   return thread_checker_.CalledOnValidThread();
 }
 
-std::ostream& operator<<(
-    std::ostream& os, ArcBridgeService::StopReason reason) {
-  switch (reason) {
-#define CASE_IMPL(val) \
-    case ArcBridgeService::StopReason::val: \
-      return os << #val
-
-    CASE_IMPL(SHUTDOWN);
-    CASE_IMPL(GENERIC_BOOT_FAILURE);
-    CASE_IMPL(LOW_DISK_SPACE);
-    CASE_IMPL(CRASH);
-#undef CASE_IMPL
-  }
-
-  // In case of unexpected value, output the int value.
-  return os << "StopReason(" << static_cast<int>(reason) << ")";
-}
-
 }  // namespace arc