Remove no-longer-needed IsBusy...() stuff.

mojo/edk/system/dispatcher.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/edk/system/dispatcher.h"
 
 #include "base/logging.h"
 #include "mojo/edk/system/configuration.h"
 #include "mojo/edk/system/data_pipe_consumer_dispatcher.h"
 #include "mojo/edk/system/data_pipe_producer_dispatcher.h"
@@ skipping 507 matching lines @@
     void* /*destination*/,
     size_t* /*actual_size*/,
     std::vector<ScopedPlatformHandle>* /*platform_handles*/) {
   AssertHasOneRef();  // Only one ref => no need to take the lock.
   DCHECK(is_closed_);
   // By default, serializing isn't supported, so just close.
   CloseImplNoLock();
   return false;
 }
 
-bool Dispatcher::IsBusyNoLock() const {
-  mutex_.AssertHeld();
-  DCHECK(!is_closed_);
-  // Most dispatchers support only "atomic" operations, so they are never busy
-  // (in this sense).
-  return false;
-}
-
 void Dispatcher::CloseNoLock() {
   mutex_.AssertHeld();
   DCHECK(!is_closed_);
 
   is_closed_ = true;
   CancelAllStateNoLock();
   CloseImplNoLock();
 }
 
 RefPtr<Dispatcher> Dispatcher::CreateEquivalentDispatcherAndCloseNoLock(
@@ skipping 38 matching lines @@
   // want to remove or weaken).
   MutexLocker locker(&mutex_);
 #endif
 
   return EndSerializeAndCloseImplNoLock(channel, destination, actual_size,
                                         platform_handles);
 }
 
 }  // namespace system
 }  // namespace mojo