Require explicit selection of traits for LazyInstance

storage/browser/blob/shareable_file_reference.cc

 // Copyright (c) 2012 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 "storage/browser/blob/shareable_file_reference.h"
 
 #include <map>
 #include <utility>
 
 #include "base/lazy_instance.h"
@@ skipping 37 matching lines @@
   void Erase(key_type key) {
     DCHECK(CalledOnValidThread());
     file_map_.erase(key);
   }
 
  private:
   FileMap file_map_;
   DISALLOW_COPY_AND_ASSIGN(ShareableFileMap);
 };
 
-base::LazyInstance<ShareableFileMap> g_file_map = LAZY_INSTANCE_INITIALIZER;
+base::LazyInstance<ShareableFileMap>::DestructorAtExit g_file_map =
+    LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 // static
 scoped_refptr<ShareableFileReference> ShareableFileReference::Get(
     const base::FilePath& path) {
   ShareableFileMap::iterator found = g_file_map.Get().Find(path);
   ShareableFileReference* reference =
       (found == g_file_map.Get().End()) ? NULL : found->second;
   return scoped_refptr<ShareableFileReference>(reference);
@@ skipping 44 matching lines @@
     : scoped_file_(std::move(scoped_file)) {
   DCHECK(g_file_map.Get().Find(path())->second == NULL);
 }
 
 ShareableFileReference::~ShareableFileReference() {
   DCHECK(g_file_map.Get().Find(path())->second == this);
   g_file_map.Get().Erase(path());
 }
 
 }  // namespace storage