Rework PE image tests to use a compiled DLL instead of a system one.

base/win/pe_image_test.cc

Index: base/win/pe_image_test.cc
diff --git a/ipc/ipc_message_attachment.cc b/base/win/pe_image_test.cc
similarity index 52%
copy from ipc/ipc_message_attachment.cc
copy to base/win/pe_image_test.cc
index 83440ae8e008847eebd411f8ffd08c69d9f529fe..afeb6873b11e451876ecd1a12f6dce7efd27a1a4 100644
--- a/ipc/ipc_message_attachment.cc
+++ b/base/win/pe_image_test.cc
@@ -2,14 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ipc/ipc_message_attachment.h"
+#include <windows.h>
 
-namespace IPC {
+extern "C" {
 
-MessageAttachment::MessageAttachment() {
+__declspec(dllexport) void export_func() {
+  HWND dummy = GetDesktopWindow();
+  SetWindowTextA(dummy, "dummy");
 }
-
-MessageAttachment::~MessageAttachment() {
 }
-
-}  // namespace IPC