Revert of Clean up public interface of AttachmentBrokerUnprivileged.

ipc/attachment_broker_privileged.cc

Index: ipc/attachment_broker_privileged.cc
diff --git a/ipc/attachment_broker_privileged.cc b/ipc/attachment_broker_privileged.cc
index 900679862937a8abf00e12458c45ce46a5d21061..85c1ac949cd858704effd0cb8dba4b4cb6ffefaf 100644
--- a/ipc/attachment_broker_privileged.cc
+++ b/ipc/attachment_broker_privileged.cc
@@ -67,7 +67,9 @@
 // the global broker.
 class AttachmentBrokerMakeOnce {
  public:
-  AttachmentBrokerMakeOnce() : attachment_broker_(CreateBroker()) {}
+  AttachmentBrokerMakeOnce() {
+    attachment_broker_.reset(CreateBroker().release());
+  }
 
  private:
   scoped_ptr<IPC::AttachmentBrokerPrivileged> attachment_broker_;
@@ -126,10 +128,6 @@
     endpoints_.erase(it);
 }
 
-bool AttachmentBrokerPrivileged::IsPrivilegedBroker() {
-  return true;
-}
-
 Sender* AttachmentBrokerPrivileged::GetSenderWithProcessId(base::ProcessId id) {
   get_lock()->AssertAcquired();
   auto it = std::find_if(endpoints_.begin(), endpoints_.end(),