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

mojo/edk/system/platform_handle_dispatcher_unittest.cc

 // Copyright 2014 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/platform_handle_dispatcher.h"
 
 #include <stdio.h>
 
 #include <utility>
 
@@ skipping 86 matching lines @@
   EXPECT_EQ(sizeof(kFooBar), fwrite(kFooBar, 1, sizeof(kFooBar), fp.get()));
 
   auto dispatcher =
       PlatformHandleDispatcher::Create(PlatformHandleFromFILE(std::move(fp)));
   Handle handle(std::move(dispatcher),
                 PlatformHandleDispatcher::kDefaultHandleRights);
 
   HandleTransport transport(test::HandleTryStartTransport(handle));
   EXPECT_TRUE(transport.is_valid());
   EXPECT_EQ(Dispatcher::Type::PLATFORM_HANDLE, transport.GetType());
-  EXPECT_FALSE(transport.IsBusy());
 
   Handle equivalent_handle =
       transport.CreateEquivalentHandleAndClose(nullptr, 0u);
   ASSERT_TRUE(equivalent_handle.dispatcher);
   EXPECT_EQ(PlatformHandleDispatcher::kDefaultHandleRights,
             equivalent_handle.rights);
 
   transport.End();
   EXPECT_TRUE(handle.dispatcher->HasOneRef());
   handle.reset();
@@ skipping 12 matching lines @@
   EXPECT_EQ(sizeof(kFooBar),
             fread(read_buffer, 1, sizeof(read_buffer), fp.get()));
   EXPECT_STREQ(kFooBar, read_buffer);
 
   EXPECT_EQ(MOJO_RESULT_OK, dispatcher->Close());
 }
 
 }  // namespace
 }  // namespace system
 }  // namespace mojo