Remove Ash shelf dimmer.

ash/aura/wm_shelf_aura.cc

Index: ash/aura/wm_shelf_aura.cc
diff --git a/ash/aura/wm_shelf_aura.cc b/ash/aura/wm_shelf_aura.cc
index 36e428e081507b0f7053c43d5bac6c1bcc495646..7feec5a600b066f80ebcbe6f7f417892b108ef26 100644
--- a/ash/aura/wm_shelf_aura.cc
+++ b/ash/aura/wm_shelf_aura.cc
@@ -6,7 +6,6 @@
 
 #include "ash/aura/wm_window_aura.h"
 #include "ash/common/shelf/shelf_layout_manager.h"
-#include "ash/shelf/dimmer_view.h"
 #include "ash/shelf/shelf_bezel_event_handler.h"
 #include "ash/shell.h"
 
@@ -47,10 +46,6 @@ WmShelfAura::WmShelfAura() {}
 
 WmShelfAura::~WmShelfAura() {}
 
-WmDimmerView* WmShelfAura::CreateDimmerView(bool disable_animations_for_test) {
-  return DimmerView::Create(this, disable_animations_for_test);
-}
-
 void WmShelfAura::CreateShelfWidget(WmWindow* root) {
   WmShelf::CreateShelfWidget(root);
   bezel_event_handler_.reset(new ShelfBezelEventHandler(this));