ipc: Move AttachmentBrokerPrivileged singleton logic into ipc/.

ipc/attachment_broker_privileged_mac_unittest.cc

Index: ipc/attachment_broker_privileged_mac_unittest.cc
diff --git a/ipc/attachment_broker_privileged_mac_unittest.cc b/ipc/attachment_broker_privileged_mac_unittest.cc
index c396ea3bc9ec43f901db6088589444294af76e3a..678f955775f5dbfeb8113e1073a3df9be2720468 100644
--- a/ipc/attachment_broker_privileged_mac_unittest.cc
+++ b/ipc/attachment_broker_privileged_mac_unittest.cc
@@ -167,7 +167,7 @@ class AttachmentBrokerPrivilegedMacMultiProcessTest
 TEST_F(AttachmentBrokerPrivilegedMacMultiProcessTest, InsertRight) {
   SetUpChild("InsertRightClient");
   mach_msg_type_number_t original_name_count = GetActiveNameCount();
-  IPC::AttachmentBrokerPrivilegedMac broker;
+  IPC::AttachmentBrokerPrivilegedMac broker(nullptr);
 
   // Create some shared memory.
   scoped_ptr<base::SharedMemory> shared_memory =
@@ -230,7 +230,7 @@ MULTIPROCESS_TEST_MAIN(InsertRightClient) {
 TEST_F(AttachmentBrokerPrivilegedMacMultiProcessTest, InsertSameRightTwice) {
   SetUpChild("InsertSameRightTwiceClient");
   mach_msg_type_number_t original_name_count = GetActiveNameCount();
-  IPC::AttachmentBrokerPrivilegedMac broker;
+  IPC::AttachmentBrokerPrivilegedMac broker(nullptr);
 
   // Create some shared memory.
   scoped_ptr<base::SharedMemory> shared_memory =
@@ -322,7 +322,7 @@ MULTIPROCESS_TEST_MAIN(InsertSameRightTwiceClient) {
 TEST_F(AttachmentBrokerPrivilegedMacMultiProcessTest, InsertTwoRights) {
   SetUpChild("InsertTwoRightsClient");
   mach_msg_type_number_t original_name_count = GetActiveNameCount();
-  IPC::AttachmentBrokerPrivilegedMac broker;
+  IPC::AttachmentBrokerPrivilegedMac broker(nullptr);
 
   for (int i = 0; i < 2; ++i) {
     // Create some shared memory.