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

mojo/edk/system/dispatcher.h

 // 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.
 
 #ifndef MOJO_EDK_SYSTEM_DISPATCHER_H_
 #define MOJO_EDK_SYSTEM_DISPATCHER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 362 matching lines @@
                                         size_t* max_size,
                                         size_t* max_platform_handles)
       MOJO_NOT_THREAD_SAFE;
   virtual bool EndSerializeAndCloseImplNoLock(
       Channel* channel,
       void* destination,
       size_t* actual_size,
       std::vector<platform::ScopedPlatformHandle>* platform_handles)
       MOJO_NOT_THREAD_SAFE;
 
-  // This should be overridden to return true if/when there's an ongoing
-  // operation (e.g., two-phase read/writes on data pipes) that should prevent a
-  // handle from being sent over a message pipe (with status "busy").
-  virtual bool IsBusyNoLock() const MOJO_SHARED_LOCKS_REQUIRED(mutex_);
-
   util::Mutex& mutex() const MOJO_LOCK_RETURNED(mutex_) { return mutex_; }
 
  private:
   FRIEND_REF_COUNTED_THREAD_SAFE(Dispatcher);
   friend class HandleTransport;
 
   // Closes the dispatcher. This must be done under lock, and unlike |Close()|,
   // the dispatcher must not be closed already. (This is the "equivalent" of
   // |CreateEquivalentDispatcherAndCloseNoLock()|, for situations where the
   // dispatcher must be disposed of instead of "transferred".)
@@ skipping 62 matching lines @@
 
 // So logging macros and |DCHECK_EQ()|, etc. work.
 inline std::ostream& operator<<(std::ostream& out, Dispatcher::Type type) {
   return out << static_cast<int>(type);
 }
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_DISPATCHER_H_