Require explicit selection of traits for LazyInstance

ui/gfx/shadow_util.cc

 // Copyright 2017 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 "ui/gfx/shadow_util.h"
 
 #include <map>
 #include <vector>
 
 #include "base/lazy_instance.h"
@@ skipping 56 matching lines @@
 
   const std::vector<ShadowValue> shadows_;
 
   const float corner_radius_;
 
   DISALLOW_COPY_AND_ASSIGN(ShadowNineboxSource);
 };
 
 // Map from elevation/corner radius pair to a cached shadow.
 using ShadowDetailsMap = std::map<std::pair<int, int>, ShadowDetails>;
-base::LazyInstance<ShadowDetailsMap> g_shadow_cache = LAZY_INSTANCE_INITIALIZER;
+base::LazyInstance<ShadowDetailsMap>::DestructorAtExit g_shadow_cache =
+    LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 ShadowDetails::ShadowDetails() {}
 ShadowDetails::ShadowDetails(const ShadowDetails& other) = default;
 ShadowDetails::~ShadowDetails() {}
 
 const ShadowDetails& ShadowDetails::Get(int elevation, int corner_radius) {
   auto iter =
       g_shadow_cache.Get().find(std::make_pair(elevation, corner_radius));
@@ skipping 17 matching lines @@
                               SkColorSetA(SK_ColorBLACK, 0x1f));
   // To see what this looks like for elevation 24, try this CSS:
   //   box-shadow: 0 24px 48px rgba(0, 0, 0, .24),
   //               0 0 24px rgba(0, 0, 0, .12);
   auto* source = new ShadowNineboxSource(shadow->values, corner_radius);
   shadow->ninebox_image = ImageSkia(source, source->size());
   return *shadow;
 }
 
 }  // namespace gfx