Stop linking in the old Mojo EDK.

ipc/attachment_broker_mac_unittest.cc

Index: ipc/attachment_broker_mac_unittest.cc
diff --git a/ipc/attachment_broker_mac_unittest.cc b/ipc/attachment_broker_mac_unittest.cc
index bf994b77db24927654950791c4e28db88417fa12..840b93bb6b64ff26feaaad8a1121e4886d789e55 100644
--- a/ipc/attachment_broker_mac_unittest.cc
+++ b/ipc/attachment_broker_mac_unittest.cc
@@ -425,7 +425,7 @@ class IPCAttachmentBrokerMacTest : public IPCTestBase {
     if (!broker_.get())
       SetBroker(new IPC::AttachmentBrokerUnprivilegedMac);
 
-    broker_->AddObserver(&observer_, task_runner());
+    broker_->AddObserver(&observer_, io_task_runner());
     CreateChannel(&proxy_listener_);
     broker_->DesignateBrokerCommunicationChannel(channel());
     ASSERT_TRUE(ConnectChannel());
@@ -963,7 +963,7 @@ TEST_F(IPCAttachmentBrokerMacTest, SendSharedMemoryHandleChannelProxy) {
   MachPreForkSetUp();
 
   SetBroker(new IPC::AttachmentBrokerUnprivilegedMac);
-  get_broker()->AddObserver(get_observer(), task_runner());
+  get_broker()->AddObserver(get_observer(), io_task_runner());
 
   scoped_ptr<base::Thread> thread(
       new base::Thread("ChannelProxyTestServerThread"));