Clean up a few unused globals.

base/message_loop/message_loop_unittest.cc

 // Copyright 2013 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 <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
@@ skipping 591 matching lines @@
 void RunTest_Nesting(MessageLoop::Type message_loop_type) {
   MessageLoop loop(message_loop_type);
 
   int depth = 100;
   MessageLoop::current()->PostTask(FROM_HERE,
                                    Bind(&NestingFunc, &depth));
   MessageLoop::current()->Run();
   EXPECT_EQ(depth, 0);
 }
 
-const wchar_t* const kMessageBoxTitle = L"MessageLoop Unit Test";
+#if defined(OS_WIN)
+const wchar_t kMessageBoxTitle[] = L"MessageLoop Unit Test";
+#endif  // defined(OS_WIN)
 
 enum TaskType {
   MESSAGEBOX,
   ENDDIALOG,
   RECURSIVE,
   TIMEDMESSAGELOOP,
   QUITMESSAGELOOP,
   ORDERED,
   PUMPS,
   SLEEP,
@@ skipping 1472 matching lines @@
   // On Linux, the pipe buffer size is 64KiB by default. The bug caused one
   // byte accumulated in the pipe per two posts, so we should repeat 128K
   // times to reproduce the bug.
   const int kNumTimes = 1 << 17;
   RunTest_RecursivePosts(MessageLoop::TYPE_DEFAULT, kNumTimes);
   RunTest_RecursivePosts(MessageLoop::TYPE_UI, kNumTimes);
   RunTest_RecursivePosts(MessageLoop::TYPE_IO, kNumTimes);
 }
 
 }  // namespace base