Switch to standard integer types in ipc/.

BUG=138542
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Review URL: https://codereview.chromium.org/1546533002

Cr-Commit-Position: refs/heads/master@{#366527}
diff --git a/ipc/mojo/ipc_channel_mojo_unittest.cc b/ipc/mojo/ipc_channel_mojo_unittest.cc
index f1982533b..37267eb6 100644
--- a/ipc/mojo/ipc_channel_mojo_unittest.cc
+++ b/ipc/mojo/ipc_channel_mojo_unittest.cc
@@ -4,6 +4,7 @@
 
 #include "ipc/mojo/ipc_channel_mojo.h"
 
+#include <stddef.h>
 #include <stdint.h>
 
 #include "base/base_paths.h"
@@ -16,6 +17,7 @@
 #include "base/test/test_timeouts.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/thread.h"
+#include "build/build_config.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_test_base.h"
 #include "ipc/ipc_test_channel_listener.h"