linux and chromeos: Turn on -Wunused-const-variable.

ash/system/chromeos/power/power_status_view.cc

Index: ash/system/chromeos/power/power_status_view.cc
diff --git a/ash/system/chromeos/power/power_status_view.cc b/ash/system/chromeos/power/power_status_view.cc
index 5323f5c1a6d3f58cbc4148c836ba636b217c5035..9cb20721dee0004b64ec34d2bf17739e85b96285 100644
--- a/ash/system/chromeos/power/power_status_view.cc
+++ b/ash/system/chromeos/power/power_status_view.cc
@@ -24,15 +24,8 @@
 namespace ash {
 namespace internal {
 
-namespace {
-
-// Top/bottom padding of the text items.
-const int kPaddingVertical = 10;
-// Specify min width of status label for layout.
-const int kLabelMinWidth = 120;
 // Padding between battery status text and battery icon on default view.
 const int kPaddingBetweenBatteryStatusAndIcon = 3;
-}  // namespace
 
 PowerStatusView::PowerStatusView(ViewType view_type,
                                  bool default_view_right_align)