Moves maintaining root_window_for_new_windows_ to Shell

ash/wm/drag_window_resizer_unittest.cc

Index: ash/wm/drag_window_resizer_unittest.cc
diff --git a/ash/wm/drag_window_resizer_unittest.cc b/ash/wm/drag_window_resizer_unittest.cc
index c0514a7cea160c9a856ec0cb80ef37ea17417c84..22d96eb1047d25c67fdb6de42bf41fe4cc1890d7 100644
--- a/ash/wm/drag_window_resizer_unittest.cc
+++ b/ash/wm/drag_window_resizer_unittest.cc
@@ -309,7 +309,7 @@ TEST_F(DragWindowResizerTest, WindowDragWithMultiDisplaysActiveRoot) {
   EXPECT_TRUE(ash::wm::CanActivateWindow(window.get()));
   ash::wm::ActivateWindow(window.get());
   EXPECT_EQ(root_windows[0], window->GetRootWindow());
-  EXPECT_EQ(root_windows[0], ash::Shell::GetTargetRootWindow());
+  EXPECT_EQ(root_windows[0], ash::Shell::GetRootWindowForNewWindows());

[James Cook, 2017/03/08 20:19:17]

nit: I don't think ash:: is needed, here or below

[sky, 2017/03/08 20:42:59]

Done.

   {
     // Grab (0, 0) of the window.
     std::unique_ptr<WindowResizer> resizer(
@@ -322,7 +322,7 @@ TEST_F(DragWindowResizerTest, WindowDragWithMultiDisplaysActiveRoot) {
     // The whole window is on the secondary display now. The parent should be
     // changed.
     EXPECT_EQ(root_windows[1], window->GetRootWindow());
-    EXPECT_EQ(root_windows[1], ash::Shell::GetTargetRootWindow());
+    EXPECT_EQ(root_windows[1], ash::Shell::GetRootWindowForNewWindows());
   }
 }