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

mojo/edk/system/handle_transport.h

 // Copyright 2016 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.
 
 #ifndef MOJO_EDK_SYSTEM_HANDLE_TRANSPORT_H_
 #define MOJO_EDK_SYSTEM_HANDLE_TRANSPORT_H_
 
 #include "mojo/edk/system/dispatcher.h"
 #include "mojo/edk/system/handle.h"
 #include "mojo/edk/util/ref_ptr.h"
@@ skipping 13 matching lines @@
 //
 // Note: This class is deliberately "thin" -- no more expensive than a struct
 // containing a |Dispatcher*| and a |MojoHandleRights|.
 class HandleTransport final {
  public:
   HandleTransport() : dispatcher_(nullptr), rights_(MOJO_HANDLE_RIGHT_NONE) {}
 
   void End() MOJO_NOT_THREAD_SAFE;
 
   Dispatcher::Type GetType() const { return dispatcher_->GetType(); }
-  bool IsBusy() const MOJO_NOT_THREAD_SAFE {
-    return dispatcher_->IsBusyNoLock();
-  }
   void Close() MOJO_NOT_THREAD_SAFE { dispatcher_->CloseNoLock(); }
   Handle CreateEquivalentHandleAndClose(MessagePipe* message_pipe,
                                         unsigned port) MOJO_NOT_THREAD_SAFE {
     return Handle(dispatcher_->CreateEquivalentDispatcherAndCloseNoLock(
                       message_pipe, port),
                   rights_);
   }
 
   bool is_valid() const { return !!dispatcher_; }
 
  private:
   friend class Dispatcher::HandleTableAccess;
 
   explicit HandleTransport(const Handle& handle)
       : dispatcher_(handle.dispatcher.get()), rights_(handle.rights) {}
 
   Dispatcher* dispatcher_;
   MojoHandleRights rights_;
 
   // Copy and assign allowed.
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_HANDLE_TRANSPORT_H_