Lint some wm:: shadow-related includes.

This CL just removes some includes that aren't used.

CrOS-style shadows are planned for more parts of the Chrome UI - parts
the window manager doesn't have good control over. So some files may
need to move.

Bug: 801583
Change-Id: I1a5a31908ae74ce373198e16dfa2809d4d60023a
Reviewed-on: https://chromium-review.googlesource.com/892585Reviewed-by: David Reveman <reveman@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533056}

ash/dip_unittest.cc

@@ -20,10 +20,6 @@
 #include "ui/display/screen.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/views/widget/widget.h"
-#include "ui/wm/core/shadow.h"
-#include "ui/wm/core/shadow_controller.h"
-#include "ui/wm/core/shadow_types.h"
-#include "ui/wm/public/activation_client.h"
 
 namespace ash {
 

ash/wm/overview/window_selector_item.cc

@@ -50,8 +50,6 @@
 #include "ui/views/layout/box_layout.h"
 #include "ui/views/window/non_client_view.h"
 #include "ui/wm/core/coordinate_conversion.h"
-#include "ui/wm/core/shadow.h"
-#include "ui/wm/core/window_util.h"
 
 namespace ash {
 

components/exo/shell_surface_unittest.cc

@@ -34,9 +34,6 @@
 #include "ui/display/manager/display_manager.h"
 #include "ui/display/screen.h"
 #include "ui/views/widget/widget.h"
-#include "ui/wm/core/shadow.h"
-#include "ui/wm/core/shadow_controller.h"
-#include "ui/wm/core/shadow_types.h"
 #include "ui/wm/core/window_util.h"
 
 namespace exo {