Fix auto raw pointer deduction on linux

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 88 matching lines @@
   // "Key shadow": y offset is elevation and blur is twice the elevation.
   shadow->values.emplace_back(gfx::Vector2d(0, elevation),
                               kBlurCorrection * elevation * 2,
                               SkColorSetA(SK_ColorBLACK, 0x3d));
   // "Ambient shadow": no offset and blur matches the elevation.
   shadow->values.emplace_back(gfx::Vector2d(), kBlurCorrection * elevation,
                               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);
+  auto* source = new ShadowNineboxSource(shadow->values, corner_radius);
   shadow->ninebox_image = ImageSkia(source, source->size());
   return *shadow;
 }
 
 }  // namespace gfx