Fix implicit access to raw pointer of scoped_refptr.

mojo/edk/system/wait_set_dispatcher_unittest.cc

Index: mojo/edk/system/wait_set_dispatcher_unittest.cc
diff --git a/mojo/edk/system/wait_set_dispatcher_unittest.cc b/mojo/edk/system/wait_set_dispatcher_unittest.cc
index 40ac2ac9a7089f83660f60e81c41b46b317e91d3..42ac86548d6ff96f6c5f12310c14e481c397cd1e 100644
--- a/mojo/edk/system/wait_set_dispatcher_unittest.cc
+++ b/mojo/edk/system/wait_set_dispatcher_unittest.cc
@@ -236,7 +236,7 @@ TEST_F(WaitSetDispatcherTest, HandleWithoutRemoving) {
     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));
   }