chromeos: Eliminate WmWindow from //ash/system

ash/system/palette/palette_tool_manager_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/system/palette/palette_tool.h"
 #include "ash/system/palette/palette_tool_manager.h"
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 37 matching lines @@
  public:
   PaletteToolManagerTest()
       : palette_tool_manager_(new PaletteToolManager(this)) {}
   ~PaletteToolManagerTest() override {}
 
  protected:
   // PaletteToolManager::Delegate:
   void HidePalette() override {}
   void HidePaletteImmediately() override {}
   void OnActiveToolChanged() override { ++tool_changed_count_; }
-  WmWindow* GetWindow() override {
+  aura::Window* GetWindow() override {
     NOTREACHED();
     return nullptr;
   }
   void RecordPaletteOptionsUsage(PaletteTrayOptions option) override {}
   void RecordPaletteModeCancellation(PaletteModeCancelType type) override {}
 
   // PaletteTool::Delegate:
   void EnableTool(PaletteToolId tool_id) override {}
   void DisableTool(PaletteToolId tool_id) override {}
 
@@ skipping 59 matching lines @@
 
   // Activating an already active tool will not do anything.
   palette_tool_manager_->ActivateTool(action_1->GetToolId());
   EXPECT_TRUE(action_1->enabled());
   EXPECT_FALSE(action_2->enabled());
   palette_tool_manager_->ActivateTool(action_1->GetToolId());
   EXPECT_TRUE(action_1->enabled());
   EXPECT_FALSE(action_2->enabled());
   palette_tool_manager_->DeactivateTool(action_1->GetToolId());
 }