Updates shadow when active window changes

mash/wm/non_client_frame_controller.cc

Index: mash/wm/non_client_frame_controller.cc
diff --git a/mash/wm/non_client_frame_controller.cc b/mash/wm/non_client_frame_controller.cc
index 4cd4027b37f0df76eaf3066749e5b1f2ba6e9b4a..ca8e9a63b58b62ee2d3690b4388c2dc134f5f427 100644
--- a/mash/wm/non_client_frame_controller.cc
+++ b/mash/wm/non_client_frame_controller.cc
@@ -117,7 +117,8 @@ class WmNativeWidgetMus : public views::NativeWidgetMus {
     aura::WindowTreeHost* window_tree_host = GetNativeView()->GetHost();
     // TODO(sky): shadow should be determined by window type.
     shadow_.reset(new Shadow);
-    shadow_->Init(Shadow::STYLE_ACTIVE);
+    shadow_->Init(Shadow::STYLE_INACTIVE);
+    SetShadow(window(), shadow_.get());
     ContentWindowLayoutManager* layout_manager = new ContentWindowLayoutManager(
         window_tree_host->window(), ShadowStyle::NORMAL, shadow_.get());
     window_tree_host->window()->SetLayoutManager(layout_manager);