Make DFAKE_MUTEX a typedef when using NDEBUG, so that pedantic compilers don't warn about an extra …

base/threading/thread_collision_warner.h

 // Copyright (c) 2011 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.
 
 #ifndef BASE_THREADING_THREAD_COLLISION_WARNER_H_
 #define BASE_THREADING_THREAD_COLLISION_WARNER_H_
 #pragma once
 
 #include <memory>
 
@@ skipping 101 matching lines @@
 // Asserts the call is never called simultaneously in two threads. Used at
 // member function scope. Same as DFAKE_SCOPED_LOCK but allows recursive locks.
 #define DFAKE_SCOPED_RECURSIVE_LOCK(obj) \
      base::ThreadCollisionWarner::ScopedRecursiveCheck sr_check_##obj(&obj)
 // Asserts the code is always executed in the same thread.
 #define DFAKE_SCOPED_LOCK_THREAD_LOCKED(obj) \
      base::ThreadCollisionWarner::Check check_##obj(&obj)
 
 #else
 
-#define DFAKE_MUTEX(obj)
+#define DFAKE_MUTEX(obj) typedef void InternalFakeMutexType##obj
 #define DFAKE_SCOPED_LOCK(obj) ((void)0)
 #define DFAKE_SCOPED_RECURSIVE_LOCK(obj) ((void)0)
 #define DFAKE_SCOPED_LOCK_THREAD_LOCKED(obj) ((void)0)
 
 #endif
 
 namespace base {
 
 // The class ThreadCollisionWarner uses an Asserter to notify the collision
 // AsserterBase is the interfaces and DCheckAsserter is the default asserter
@@ skipping 103 matching lines @@
   // Here only for class unit tests purpose, during the test I need to not
   // DCHECK but notify the collision with something else.
   AsserterBase* asserter_;
 
   DISALLOW_COPY_AND_ASSIGN(ThreadCollisionWarner);
 };
 
 }  // namespace base
 
 #endif  // BASE_THREADING_THREAD_COLLISION_WARNER_H_