Move Screen, its impls, DisplayObserver and DisplayChangeNotifier to ui/display

ui/display/screen_unittest.cc

Index: ui/display/screen_unittest.cc
diff --git a/ui/gfx/screen_unittest.cc b/ui/display/screen_unittest.cc
similarity index 74%
rename from ui/gfx/screen_unittest.cc
rename to ui/display/screen_unittest.cc
index 8b63ac70b52a3a493ffb110f0fee463a95ca4560..f9b9d0cf65b6b651c585f43a63b1abfdbe261ebe 100644
--- a/ui/gfx/screen_unittest.cc
+++ b/ui/display/screen_unittest.cc
@@ -2,22 +2,22 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/gfx/screen.h"
+#include "ui/display/screen.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
-namespace {
+namespace display {
 
 TEST(ScreenTest, GetPrimaryDisplaySize) {
   // We aren't actually testing that it's correct, just that it's sane.
-  const gfx::Size size = gfx::Screen::GetScreen()->GetPrimaryDisplay().size();
+  const gfx::Size size = Screen::GetScreen()->GetPrimaryDisplay().size();
   EXPECT_GE(size.width(), 1);
   EXPECT_GE(size.height(), 1);
 }
 
 TEST(ScreenTest, GetNumDisplays) {
   // We aren't actually testing that it's correct, just that it's sane.
-  EXPECT_GE(gfx::Screen::GetScreen()->GetNumDisplays(), 1);
+  EXPECT_GE(Screen::GetScreen()->GetNumDisplays(), 1);
 }
 
 }  // namespace