Enable Clang warnings in .cc files for Linux+[Aura/ChromeOS]

ash/focus_cycler_unittest.cc

Index: ash/focus_cycler_unittest.cc
diff --git a/ash/focus_cycler_unittest.cc b/ash/focus_cycler_unittest.cc
index 5854f8ddcdf4d03d420c4e2e70b0b4b83603275b..aebede49b07bf1833734531daa8e4e90c60246a7 100644
--- a/ash/focus_cycler_unittest.cc
+++ b/ash/focus_cycler_unittest.cc
@@ -46,8 +46,9 @@ class PanedWidgetDelegate : public views::WidgetDelegate {
   }
 
   // views::WidgetDelegate.
-  virtual void GetAccessiblePanes(std::vector<views::View*>* panes) {
-    std::copy(accessible_panes_.begin(), accessible_panes_.end(),
+  virtual void GetAccessiblePanes(std::vector<views::View*>* panes) OVERRIDE {
+    std::copy(accessible_panes_.begin(),
+              accessible_panes_.end(),
               std::back_inserter(*panes));
   }
   virtual views::Widget* GetWidget() OVERRIDE {