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

ui/views/controls/textfield/textfield.cc

 // Copyright (c) 2012 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 "ui/views/controls/textfield/textfield.h"
 
 #include <string>
 
 #include "base/debug/trace_event.h"
 #include "grit/ui_strings.h"
@@ skipping 463 matching lines @@
   return initiating_drag_;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Textfield, View overrides:
 
 int Textfield::GetBaseline() const {
   return GetInsets().top() + GetRenderText()->GetBaseline();
 }
 
-gfx::Size Textfield::GetPreferredSize() {
+gfx::Size Textfield::GetPreferredSize() const {
   const gfx::Insets& insets = GetInsets();
   return gfx::Size(GetFontList().GetExpectedTextWidth(default_width_in_chars_) +
                    insets.width(), GetFontList().GetHeight() + insets.height());
 }
 
 const char* Textfield::GetClassName() const {
   return kViewClassName;
 }
 
 gfx::NativeCursor Textfield::GetCursor(const ui::MouseEvent& event) {
@@ skipping 1185 matching lines @@
       const size_t length = selection_clipboard_text.length();
       range = gfx::Range(range.start() + length, range.end() + length);
     }
     model_->MoveCursorTo(gfx::SelectionModel(range, affinity));
     UpdateAfterChange(true, true);
     OnAfterUserAction();
   }
 }
 
 }  // namespace views