Re-enable test (disabled while moving printing functionality to printing libr...

printing/printing_context_win.cc

 // Copyright (c) 2006-2008 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 "printing/printing_context.h"
 
 #include <winspool.h>
 
 #include "base/file_util.h"
 #include "base/message_loop.h"
@@ skipping 270 matching lines @@
     filename += base::TimeFormatTimeOfDay(now);
     filename += L"_";
     filename += document_name;
     filename += L"_";
     filename += L"buffer.prn";
     file_util::ReplaceIllegalCharacters(&filename, '_');
     file_util::AppendToPath(&debug_dump_path, filename);
     di.lpszOutput = debug_dump_path.c_str();
   }
 
-  DCHECK_EQ(MessageLoop::current()->NestableTasksAllowed(), false);
+  // No message loop running in unit tests.
+  DCHECK(!MessageLoop::current() ? true :
+      !MessageLoop::current()->NestableTasksAllowed());
+
   // Begin a print job by calling the StartDoc function.
   // NOTE: StartDoc() starts a message loop. That causes a lot of problems with
   // IPC. Make sure recursive task processing is disabled.
   if (StartDoc(hdc_, &di) <= 0)
     return OnError();
 
 #ifndef NDEBUG
   page_number_ = 0;
 #endif
   return OK;
@@ skipping 296 matching lines @@
 
   if (dialog_options.hDevMode != NULL)
     GlobalFree(dialog_options.hDevMode);
   if (dialog_options.hDevNames != NULL)
     GlobalFree(dialog_options.hDevNames);
 
   return hdc_ ? OK : FAILED;
 }
 
 }  // namespace printing