Simplify PortAllocatorBase and make PortAllocator creation synchronous.

remoting/host/cast_extension.cc

Index: remoting/host/cast_extension.cc
diff --git a/remoting/host/cast_extension.cc b/remoting/host/cast_extension.cc
index cf2d51c30b7f43e887f78ec48e17566533a719f1..b31844c32d1562a0a00d577708a7cb41342847e9 100644
--- a/remoting/host/cast_extension.cc
+++ b/remoting/host/cast_extension.cc
@@ -6,23 +6,17 @@
 
 #include "net/url_request/url_request_context_getter.h"
 #include "remoting/host/cast_extension_session.h"
-#include "remoting/protocol/network_settings.h"
+#include "remoting/protocol/transport_context.h"
 
 namespace remoting {
 
 const char kCapability[] = "casting";
 
 CastExtension::CastExtension(
-    scoped_refptr<base::SingleThreadTaskRunner> network_task_runner,
-    scoped_refptr<net::URLRequestContextGetter> url_request_context_getter,
-    const protocol::NetworkSettings& network_settings)
-    : network_task_runner_(network_task_runner),
-      url_request_context_getter_(url_request_context_getter),
-      network_settings_(network_settings) {
-}
+    scoped_refptr<protocol::TransportContext> transport_context)
+    : transport_context_(transport_context) {}
 
-CastExtension::~CastExtension() {
-}
+CastExtension::~CastExtension() {}
 
 std::string CastExtension::capability() const {
   return kCapability;
@@ -31,9 +25,8 @@ std::string CastExtension::capability() const {
 scoped_ptr<HostExtensionSession> CastExtension::CreateExtensionSession(
     ClientSessionControl* client_session_control,
     protocol::ClientStub* client_stub) {
-  return CastExtensionSession::Create(
-      network_task_runner_, url_request_context_getter_, network_settings_,
-      client_session_control, client_stub);
+  return CastExtensionSession::Create(transport_context_,
+                                      client_session_control, client_stub);
 }
 
 }  // namespace remoting