Prefix CommandLine usage with base namespace (Part 4: ash/)

ash/system/tray/system_tray_unittest.cc

Index: ash/system/tray/system_tray_unittest.cc
diff --git a/ash/system/tray/system_tray_unittest.cc b/ash/system/tray/system_tray_unittest.cc
index fdebbb0ab37031029d6c5984337f980284a45436..5de14ea837bfba86d3c41b538a1c416f6f21ee20 100644
--- a/ash/system/tray/system_tray_unittest.cc
+++ b/ash/system/tray/system_tray_unittest.cc
@@ -152,7 +152,7 @@ class SystemTrayTest : public AshTestBase {
   ~SystemTrayTest() override {}
 
   void SetUp() override {
-    CommandLine::ForCurrentProcess()->AppendSwitch(
+    base::CommandLine::ForCurrentProcess()->AppendSwitch(
         switches::kEnableTouchFeedback);
     test::AshTestBase::SetUp();
   }