Make spacing between uber tray items consistent with UI spec.

ash/system/date/date_view.cc

Index: ash/system/date/date_view.cc
diff --git a/ash/system/date/date_view.cc b/ash/system/date/date_view.cc
index ebd98d14e5fb17c470fc01b8d3ac8653118f46c3..3ba47d67a2a7fb51097384e3c1286ce12bda12c6 100644
--- a/ash/system/date/date_view.cc
+++ b/ash/system/date/date_view.cc
@@ -222,14 +222,14 @@ void TimeView::UpdateClockLayout(TrayDate::ClockLayout clock_layout){
                        0, views::GridLayout::USE_PREF, 0, 0);
     columns->AddColumn(views::GridLayout::CENTER, views::GridLayout::CENTER,
                        0, views::GridLayout::USE_PREF, 0, 0);
-    layout->AddPaddingRow(0, 4);
+    layout->AddPaddingRow(0, kTrayLabelItemVerticalPaddingVeriticalAlignment);
     layout->StartRow(0, 0);
     layout->AddView(label_hour_left_.get());
     layout->AddView(label_hour_right_.get());
     layout->StartRow(0, 0);
     layout->AddView(label_minute_left_.get());
     layout->AddView(label_minute_right_.get());
-    layout->AddPaddingRow(0, 4);
+    layout->AddPaddingRow(0, kTrayLabelItemVerticalPaddingVeriticalAlignment);
   }
   Layout();
   set_focusable(true);
@@ -237,7 +237,9 @@ void TimeView::UpdateClockLayout(TrayDate::ClockLayout clock_layout){
 
 void TimeView::SetBorder(TrayDate::ClockLayout clock_layout) {
   if (clock_layout == TrayDate::HORIZONTAL_CLOCK)
-    set_border(views::Border::CreateEmptyBorder(0, 10, 0, 7));
+    set_border(views::Border::CreateEmptyBorder(
+        0, kTrayLabelItemHorizontalPaddingBottomAlignment,
+        0, kTrayLabelItemHorizontalPaddingBottomAlignment));
   else
     set_border(NULL);
 }