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

chrome/browser/ui/views/apps/app_info_dialog/app_info_permissions_tab.cc

Index: chrome/browser/ui/views/apps/app_info_dialog/app_info_permissions_tab.cc
diff --git a/chrome/browser/ui/views/apps/app_info_dialog/app_info_permissions_tab.cc b/chrome/browser/ui/views/apps/app_info_dialog/app_info_permissions_tab.cc
index bf5a7791f1bdb7d594734deae136f44e44b13a00..9e27e13ffb1f23d60abbbb46451236dde8c0e446 100644
--- a/chrome/browser/ui/views/apps/app_info_dialog/app_info_permissions_tab.cc
+++ b/chrome/browser/ui/views/apps/app_info_dialog/app_info_permissions_tab.cc
@@ -64,7 +64,7 @@ class ExpandableContainerView : public views::View,
     virtual ~DetailsView() {}
 
     // views::View:
-    virtual gfx::Size GetPreferredSize() OVERRIDE;
+    virtual gfx::Size GetPreferredSize() const OVERRIDE;
 
     // Animates this to be a height proportional to |ratio|.
     void AnimateToRatio(double ratio);
@@ -140,7 +140,7 @@ ExpandableContainerView::DetailsView::DetailsView(
   }
 }
 
-gfx::Size ExpandableContainerView::DetailsView::GetPreferredSize() {
+gfx::Size ExpandableContainerView::DetailsView::GetPreferredSize() const {
   gfx::Size size = views::View::GetPreferredSize();
   return gfx::Size(size.width(), size.height() * visible_ratio_);
 }