Fix asan bot build

ash/display/multi_display_manager.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 "ash/display/multi_display_manager.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/display/display_controller.h"
@@ skipping 152 matching lines @@
     return displays_[0];
   const RootWindow* root = window->GetRootWindow();
   MultiDisplayManager* manager = const_cast<MultiDisplayManager*>(this);
   return root ? manager->FindDisplayForRootWindow(root) : GetInvalidDisplay();
 }
 
 const gfx::Display& MultiDisplayManager::GetDisplayNearestPoint(
     const gfx::Point& point) const {
   // Fallback to the primary display if there is no root display containing
   // the |point|.
-  gfx::Display display = FindDisplayContainingPoint(point);
+  const gfx::Display& display = FindDisplayContainingPoint(point);
   return display.is_valid() ? display : displays_[0];
 }
 
 const gfx::Display& MultiDisplayManager::GetDisplayMatching(
     const gfx::Rect& rect) const {
   if (rect.IsEmpty())
     return GetDisplayNearestPoint(rect.origin());
 
   int max = 0;
   const gfx::Display* matching = 0;
@@ skipping 119 matching lines @@
 
   const gfx::Insets insets = display.GetWorkAreaInsets();
   const gfx::Rect& native_bounds = display.bounds_in_pixel();
   display.SetScaleAndBounds(display.device_scale_factor(), native_bounds);
   display.UpdateWorkAreaFromInsets(insets);
   displays_.push_back(display);
 }
 
 }  // namespace internal
 }  // namespace ash