Remove usage of CoAP kAckTimeout in Link Raw API. (#1580)

src/core/api/link_raw_api.cpp

@@ -377,7 +377,7 @@ ThreadError LinkRaw::DoTransmit(RadioPacket *aPacket)
     {
         otLogDebgPlat(aInstance, "LinkRaw Starting AckTimeout Timer");
         mTimerReason = kTimerReasonAckTimeout;
-        mTimer.Start(kAckTimeout);
+        mTimer.Start(Mac::kAckTimeout);
     }
 
 #endif

src/core/meshcop/joiner_router.cpp

@@ -265,7 +265,7 @@ void JoinerRouter::HandleRelayTransmit(Coap::Header &aHeader, Message &aMessage,
     SuccessOrExit(error = Tlv::GetValueOffset(aMessage, Tlv::kJoinerDtlsEncapsulation, offset, length));
 
     VerifyOrExit((message = mSocket.NewMessage(0)) != NULL, error = kThreadError_NoBufs);
-    message->SetPriority(kMeshCoPMessagePriority);
+    message->SetPriority(Coap::kMeshCoPMessagePriority);
     message->SetLinkSecurityEnabled(false);
 
     while (length)

src/core/thread/network_diagnostic.hpp

@@ -45,7 +45,6 @@
 namespace Thread {
 
 class ThreadNetif;
-using namespace Coap;
 
 namespace NetworkDiagnostic {