Fix implicit access to raw pointer of scoped_refptr.

mojo/edk/system/wait_set_dispatcher_unittest.cc

 // Copyright 2015 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/wait_set_dispatcher.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 218 matching lines @@
     uint32_t num_bytes = sizeof(read_buffer);
     ReadMessage(dispatcher0_.get(), read_buffer, &num_bytes);
     EXPECT_EQ(sizeof(buffer), num_bytes);
 
     // No dispatchers are ready.
     w.Init();
     woken_dispatcher = nullptr;
     context = 0;
     EXPECT_EQ(MOJO_RESULT_SHOULD_WAIT,
               GetOneReadyDispatcher(wait_set, &woken_dispatcher, &context));
-    EXPECT_EQ(nullptr, woken_dispatcher);
+    EXPECT_FALSE(woken_dispatcher);
     EXPECT_EQ(0u, context);
     EXPECT_EQ(MOJO_RESULT_DEADLINE_EXCEEDED, w.Wait(0, nullptr));
   }
 
   wait_set->RemoveAwakable(&w, nullptr);
 }
 
 TEST_F(WaitSetDispatcherTest, MultipleReady) {
   scoped_refptr<WaitSetDispatcher> wait_set = new WaitSetDispatcher();
   CloseOnShutdown(wait_set);
@@ skipping 234 matching lines @@
   EXPECT_EQ(MOJO_RESULT_OK,
             GetOneReadyDispatcher(wait_set, &woken_dispatcher, nullptr));
   EXPECT_EQ(nested_wait_set, woken_dispatcher);
 
   wait_set->RemoveAwakable(&w, nullptr);
 }
 
 }  // namespace
 }  // namespace edk
 }  // namespace mojo