[mus+ash] Removes WmWindow from ash/wm/overview and ash/wm/workspace

ash/aura/shell_port_classic.cc

Index: ash/aura/shell_port_classic.cc
diff --git a/ash/aura/shell_port_classic.cc b/ash/aura/shell_port_classic.cc
index e1b66fa0e172750e0851beb2afd0dc1c8657b75b..d27eb274115b0f62dfa8155a33bb3d6bdbf7c0c8 100644
--- a/ash/aura/shell_port_classic.cc
+++ b/ash/aura/shell_port_classic.cc
@@ -112,11 +112,11 @@ bool ShellPortClassic::IsInUnifiedModeIgnoreMirroring() const {
          display::DisplayManager::UNIFIED;
 }
 
-void ShellPortClassic::SetDisplayWorkAreaInsets(WmWindow* window,
+void ShellPortClassic::SetDisplayWorkAreaInsets(aura::Window* window,
                                                 const gfx::Insets& insets) {
   Shell::Get()
       ->window_tree_host_manager()
-      ->UpdateWorkAreaOfDisplayNearestWindow(window->aura_window(), insets);
+      ->UpdateWorkAreaOfDisplayNearestWindow(window, insets);
 }
 
 std::unique_ptr<display::TouchTransformSetter>
@@ -191,7 +191,7 @@ ShellPortClassic::CreateTabletModeEventHandler() {
 }
 
 std::unique_ptr<WorkspaceEventHandler>
-ShellPortClassic::CreateWorkspaceEventHandler(WmWindow* workspace_window) {
+ShellPortClassic::CreateWorkspaceEventHandler(aura::Window* workspace_window) {
   return base::MakeUnique<WorkspaceEventHandlerAura>(workspace_window);
 }