views: Make view::Views::GetPreferredSize() const.

ash/accelerators/exit_warning_handler.cc

 // Copyright 2013 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/accelerators/exit_warning_handler.h"
 
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
@@ skipping 70 matching lines @@
     label->SetText(text_);
     label->SetHorizontalAlignment(gfx::ALIGN_CENTER);
     label->SetFontList(font_list);
     label->SetEnabledColor(kTextColor);
     label->SetDisabledColor(kTextColor);
     label->SetAutoColorReadabilityEnabled(false);
     AddChildView(label);
     SetLayoutManager(new views::FillLayout);
   }
 
-  virtual gfx::Size GetPreferredSize() OVERRIDE {
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
     return gfx::Size(width_, height_);
   }
 
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
     SkPaint paint;
     paint.setStyle(SkPaint::kFill_Style);
     paint.setColor(kWindowBackgroundColor);
     canvas->DrawRoundRect(GetLocalBounds(), kWindowCornerRadius, paint);
     views::WidgetDelegateView::OnPaint(canvas);
   }
@@ skipping 98 matching lines @@
   widget_->Show();
 
   delegate->NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
 }
 
 void ExitWarningHandler::Hide() {
   widget_.reset();
 }
 
 }  // namespace ash