Allow linker initialization of lazy instance

base/threading/thread_restrictions.cc

 // Copyright (c) 2010 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 "base/threading/thread_restrictions.h"
 
 // This entire file is compiled out in Release mode.
 #ifndef NDEBUG
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/threading/thread_local.h"
 
 namespace base {
 
 namespace {
 
 LazyInstance<ThreadLocalBoolean, LeakyLazyInstanceTraits<ThreadLocalBoolean> >
-    g_io_disallowed(LINKER_INITIALIZED);
+    g_io_disallowed = LINKER_ZERO_INITIALIZED;
 
 LazyInstance<ThreadLocalBoolean, LeakyLazyInstanceTraits<ThreadLocalBoolean> >
-    g_singleton_disallowed(LINKER_INITIALIZED);
+    g_singleton_disallowed = LINKER_ZERO_INITIALIZED;
 
 }  // anonymous namespace
 
 // static
 bool ThreadRestrictions::SetIOAllowed(bool allowed) {
   bool previous_disallowed = g_io_disallowed.Get().Get();
   g_io_disallowed.Get().Set(!allowed);
   return !previous_disallowed;
 }
 
@@ skipping 21 matching lines @@
     LOG(FATAL) << "LazyInstance/Singleton is not allowed to be used on this "
                << "thread.  Most likely it's because this thread is not "
                << "joinable, so AtExitManager may have deleted the object "
                << "on shutdown, leading to a potential shutdown crash.";
   }
 }
 
 }  // namespace base
 
 #endif  // NDEBUG