Gut ash::MaterialDesignController, and remove the about:flags entry.

ash/common/wm/overview/window_selector_item.cc

Index: ash/common/wm/overview/window_selector_item.cc
diff --git a/ash/common/wm/overview/window_selector_item.cc b/ash/common/wm/overview/window_selector_item.cc
index 09bc82556549e4fc773e01c52e11988da0b33210..207a4ec6b390182b2e91562062d60b562acd46ed 100644
--- a/ash/common/wm/overview/window_selector_item.cc
+++ b/ash/common/wm/overview/window_selector_item.cc
@@ -673,13 +673,12 @@ void WindowSelectorItem::CreateWindowLabel(const base::string16& title) {
   // Note: current shadow implementation does not allow proper animation when
   // the parent layer bounds change during the animation since
   // Shadow::UpdateLayerBounds() only happens before the animation starts.
-  if (ash::MaterialDesignController::GetMode() ==
-      ash::MaterialDesignController::Mode::MATERIAL_EXPERIMENTAL) {
-    shadow_.reset(new ::wm::Shadow());
-    shadow_->Init(::wm::ShadowElevation::MEDIUM);
-    shadow_->layer()->SetVisible(true);
-    item_widget_->GetLayer()->Add(shadow_->layer());
-  }
+#if 0

[tdanderson, 2017/02/13 17:36:28]

Just delete this code instead.

[Evan Stade, 2017/02/13 17:41:01]

there's other related code throughout this file (behind if (shadow_)) -- Valery
are you OK with deleting it all?

[varkha, 2017/02/13 17:44:01]

Yes, please go ahead. The shadow was barely visible with the colors we use in
any case.

[Evan Stade, 2017/02/13 17:52:24]

indeed, it was supposed to be there for Alt+Tab too but I couldn't see it no
matter how much I squinted so I never added it.

[Evan Stade, 2017/02/13 19:29:42]

Done.

+  shadow_.reset(new ::wm::Shadow());
+  shadow_->Init(::wm::ShadowElevation::MEDIUM);
+  shadow_->layer()->SetVisible(true);
+  item_widget_->GetLayer()->Add(shadow_->layer());
+#endif
   item_widget_->GetLayer()->SetMasksToBounds(false);
 }