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

ui/views/test/test_views.cc

Index: ui/views/test/test_views.cc
diff --git a/ui/views/test/test_views.cc b/ui/views/test/test_views.cc
index ad2cefbccb6759514cff846a76e383957138661f..0c391b0d5823347cd02bbc6999f63a8e2fd11c27 100644
--- a/ui/views/test/test_views.cc
+++ b/ui/views/test/test_views.cc
@@ -10,7 +10,7 @@ StaticSizedView::StaticSizedView(const gfx::Size& size) : size_(size) {}
 
 StaticSizedView::~StaticSizedView() {}
 
-gfx::Size StaticSizedView::GetPreferredSize() {
+gfx::Size StaticSizedView::GetPreferredSize() const {
   return size_;
 }
 
@@ -19,7 +19,7 @@ ProportionallySizedView::ProportionallySizedView(int factor)
 
 ProportionallySizedView::~ProportionallySizedView() {}
 
-int ProportionallySizedView::GetHeightForWidth(int w) {
+int ProportionallySizedView::GetHeightForWidth(int w) const {
   return w * factor_;
 }