Convert the few remaining ARRAYSIZE_UNSAFE -> arraysize.

mojo/examples/window_manager/debug_panel.cc

Index: mojo/examples/window_manager/debug_panel.cc
diff --git a/mojo/examples/window_manager/debug_panel.cc b/mojo/examples/window_manager/debug_panel.cc
index 7d86cfef7fdf654b5eecd0afd5e46af5350a02df..7551fb4684aa4a56e3ed29501d8bd10df340d750 100644
--- a/mojo/examples/window_manager/debug_panel.cc
+++ b/mojo/examples/window_manager/debug_panel.cc
@@ -99,7 +99,7 @@ void DebugPanel::Layout(views::View* view) {
     navigation_target_new_,
     navigation_target_source_,
   };
-  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(radios); ++i) {
+  for (size_t i = 0; i < arraysize(radios); ++i) {
     radios[i]->SetBounds(kControlBorderInset, y, w,
                          radios[i]->GetPreferredSize().height());
     y += radios[i]->height();
@@ -111,7 +111,7 @@ void DebugPanel::Layout(views::View* view) {
     close_last_,
     cross_app_,
   };
-  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(buttons); ++i) {
+  for (size_t i = 0; i < arraysize(buttons); ++i) {
     buttons[i]->SetBounds(kControlBorderInset, y, w,
                           buttons[i]->GetPreferredSize().height());
     y += buttons[i]->height();