views: Also const-ify GetMaximumSize().

ui/views/bubble/tray_bubble_view.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/bubble/tray_bubble_view.h"
 
 #include <algorithm>
 
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkColor.h"
@@ skipping 406 matching lines @@
 
 void TrayBubbleView::GetWidgetHitTestMask(gfx::Path* mask) const {
   DCHECK(mask);
   mask->addRect(gfx::RectToSkRect(GetBubbleFrameView()->GetContentsBounds()));
 }
 
 gfx::Size TrayBubbleView::GetPreferredSize() const {
   return gfx::Size(preferred_width_, GetHeightForWidth(preferred_width_));
 }
 
-gfx::Size TrayBubbleView::GetMaximumSize() {
+gfx::Size TrayBubbleView::GetMaximumSize() const {
   gfx::Size size = GetPreferredSize();
   size.set_width(params_.max_width);
   return size;
 }
 
 int TrayBubbleView::GetHeightForWidth(int width) const {
   int height = GetInsets().height();
   width = std::max(width - GetInsets().width(), 0);
   for (int i = 0; i < child_count(); ++i) {
     const View* child = child_at(i);
@@ skipping 62 matching lines @@
 void TrayBubbleView::ViewHierarchyChanged(
     const ViewHierarchyChangedDetails& details) {
   if (details.is_add && details.child == this) {
     details.parent->SetPaintToLayer(true);
     details.parent->SetFillsBoundsOpaquely(true);
     details.parent->layer()->SetMasksToBounds(true);
   }
 }
 
 }  // namespace views