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

ui/views/window/dialog_delegate_unittest.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 "base/strings/utf_string_conversions.h"
 #include "ui/base/hit_test.h"
 #include "ui/views/bubble/bubble_border.h"
 #include "ui/views/bubble/bubble_frame_view.h"
 #include "ui/views/controls/button/checkbox.h"
 #include "ui/views/controls/button/label_button.h"
@@ skipping 19 matching lines @@
   virtual bool Cancel() OVERRIDE {
     canceled_ = true;
     return closeable_;
   }
   virtual bool Accept() OVERRIDE {
     accepted_ = true;
     return closeable_;
   }
 
   // DialogDelegateView overrides:
-  virtual gfx::Size GetPreferredSize() OVERRIDE { return gfx::Size(200, 200); }
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
+    return gfx::Size(200, 200);
+  }
   virtual base::string16 GetWindowTitle() const OVERRIDE { return title_; }
 
   // ButtonListener override:
   virtual void ButtonPressed(Button* sender, const ui::Event& event) OVERRIDE {
     last_pressed_button_ = sender;
   }
 
   Button* last_pressed_button() const { return last_pressed_button_; }
 
   void PressEnterAndCheckStates(Button* button) {
@@ skipping 166 matching lines @@
             frame2->GetPreferredSize().height());
 
   // Giving the default test dialog a title will yield the same bounds.
   dialog()->set_title(base::ASCIIToUTF16("Title"));
   dialog()->GetWidget()->UpdateWindowTitle();
   EXPECT_EQ(frame1->GetPreferredSize().height(),
             frame2->GetPreferredSize().height());
 }
 
 }  // namespace views