Remove explicit singletonness of ArcBridgeService part 5.

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 be3e44d1597fd85c2c113e7ec46d2a71556937ad..d8bb59afccdd90eb5ea49bafda93e11c614af318 100644
--- a/components/arc/arc_bridge_service.cc
+++ b/components/arc/arc_bridge_service.cc
@@ -21,9 +21,6 @@ const base::Feature kArcEnabledFeature{"EnableARC",
 
 }  // namespace
 
-// Weak pointer.  This class is owned by ArcServiceManager.
-ArcBridgeService* g_arc_bridge_service = nullptr;
-
 ArcBridgeService::ArcBridgeService()
     : state_(State::STOPPED),
       stop_reason_(StopReason::SHUTDOWN),
@@ -35,18 +32,6 @@ ArcBridgeService::~ArcBridgeService() {
 }
 
 // static
-ArcBridgeService* ArcBridgeService::Get() {
-  if (!g_arc_bridge_service) {
-    // ArcBridgeService may be indirectly referenced in unit tests where
-    // ArcBridgeService is optional.
-    LOG(ERROR) << "ArcBridgeService is not ready.";
-    return nullptr;
-  }
-  DCHECK(g_arc_bridge_service->CalledOnValidThread());
-  return g_arc_bridge_service;
-}
-
-// static
 bool ArcBridgeService::GetEnabled(const base::CommandLine* command_line) {
   return command_line->HasSwitch(chromeos::switches::kEnableArc) ||
          (command_line->HasSwitch(chromeos::switches::kArcAvailable) &&