Moves Shell::maximize_mode_controller() to WmShell

ash/frame/custom_frame_view_ash_unittest.cc

Index: ash/frame/custom_frame_view_ash_unittest.cc
diff --git a/ash/frame/custom_frame_view_ash_unittest.cc b/ash/frame/custom_frame_view_ash_unittest.cc
index c1b7e0d8582c9ad94239a5b90c4a5dde44ffb53e..bfcd11447da02365e75bdcda8d2ae52ca2c39add 100644
--- a/ash/frame/custom_frame_view_ash_unittest.cc
+++ b/ash/frame/custom_frame_view_ash_unittest.cc
@@ -207,16 +207,14 @@ TEST_F(CustomFrameViewAshTest, HeaderViewNotifiedOfChildSizeChange) {
 
   const gfx::Rect initial =
       delegate->GetFrameCaptionButtonContainerViewBounds();
-  Shell::GetInstance()
-      ->maximize_mode_controller()
-      ->EnableMaximizeModeWindowManager(true);
+  WmShell::Get()->maximize_mode_controller()->EnableMaximizeModeWindowManager(
+      true);
   delegate->EndFrameCaptionButtonContainerViewAnimations();
   const gfx::Rect maximize_mode_bounds =
       delegate->GetFrameCaptionButtonContainerViewBounds();
   EXPECT_GT(initial.width(), maximize_mode_bounds.width());
-  Shell::GetInstance()
-      ->maximize_mode_controller()
-      ->EnableMaximizeModeWindowManager(false);
+  WmShell::Get()->maximize_mode_controller()->EnableMaximizeModeWindowManager(
+      false);
   delegate->EndFrameCaptionButtonContainerViewAnimations();
   const gfx::Rect after_restore =
       delegate->GetFrameCaptionButtonContainerViewBounds();