Fix namespace for src/ui/display/.

ui/display/test/display_matchers.h

 // Copyright 2016 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.
 
 #ifndef UI_DISPLAY_TEST_DISPLAY_MATCHERS_H_
 #define UI_DISPLAY_TEST_DISPLAY_MATCHERS_H_
 
 #include "testing/gmock/include/gmock/gmock.h"
 #include "ui/display/types/display_mode.h"
 
 namespace display {
 
 // Matcher for DisplayMode size and refresh rate.
-testing::Matcher<const ui::DisplayMode&>
-IsDisplayMode(int width, int height, float refresh_rate = 60.0f);
+testing::Matcher<const DisplayMode&> IsDisplayMode(int width,
+                                                   int height,
+                                                   float refresh_rate = 60.0f);
 
 }  // namespace display
 
 #endif  // UI_DISPLAY_TEST_DISPLAY_MATCHERS_H_