[cast_channel] Make CastSocketService a global leaky singleton

extensions/browser/api/cast_channel/cast_channel_apitest.cc

Index: extensions/browser/api/cast_channel/cast_channel_apitest.cc
diff --git a/extensions/browser/api/cast_channel/cast_channel_apitest.cc b/extensions/browser/api/cast_channel/cast_channel_apitest.cc
index 1639bf609142783f6d28f20634ab6e7747fc4c4b..2579426df59cad6a2815b27d56749c4add7af487 100644
--- a/extensions/browser/api/cast_channel/cast_channel_apitest.cc
+++ b/extensions/browser/api/cast_channel/cast_channel_apitest.cc
@@ -14,7 +14,6 @@
 #include "chrome/browser/ui/browser.h"
 #include "components/cast_channel/cast_socket.h"
 #include "components/cast_channel/cast_socket_service.h"
-#include "components/cast_channel/cast_socket_service_factory.h"
 #include "components/cast_channel/cast_test_util.h"
 #include "components/cast_channel/logger.h"
 #include "components/cast_channel/proto/cast_channel.pb.h"
@@ -145,8 +144,11 @@ class CastChannelAPITest : public ExtensionApiTest {
           .WillOnce(Return(ReadyState::OPEN))
           .RetiresOnSaturation();
       EXPECT_CALL(*mock_cast_socket_, ready_state())
-          .WillOnce(Return(ReadyState::CLOSED));
+          .Times(2)
+          .WillRepeatedly(Return(ReadyState::CLOSED));
     }
+    EXPECT_CALL(*mock_cast_socket_, Close(_))
+        .WillOnce(InvokeCompletionCallback<0>(net::OK));
   }
 
   extensions::CastChannelAPI* GetApi() {
@@ -154,9 +156,7 @@ class CastChannelAPITest : public ExtensionApiTest {
   }
 
   cast_channel::CastSocketService* GetCastSocketService() {
-    return cast_channel::CastSocketServiceFactory::GetForBrowserContext(
-               profile())
-        .get();
+    return cast_channel::CastSocketService::GetInstance();
   }
 
   // Logs some bogus error details and calls the OnError handler.