Eliminate ash::internal namespace

ash/wm/workspace/two_step_edge_cycler.cc

Index: ash/wm/workspace/two_step_edge_cycler.cc
diff --git a/ash/wm/workspace/two_step_edge_cycler.cc b/ash/wm/workspace/two_step_edge_cycler.cc
index 76da2a1bb91aa973628186f47115973600bca647..3dd44372fc4aec6b9f4932fd4432883a4a8577e8 100644
--- a/ash/wm/workspace/two_step_edge_cycler.cc
+++ b/ash/wm/workspace/two_step_edge_cycler.cc
@@ -7,8 +7,6 @@
 #include <cmath>
 
 namespace ash {
-namespace internal {
-
 namespace {
 
 // We cycle to the second mode if any of the following happens while the mouse
@@ -46,5 +44,4 @@ void TwoStepEdgeCycler::OnMove(const gfx::Point& location) {
   time_last_move_ = base::TimeTicks::Now();
 }
 
-}  // namespace internal
 }  // namespace ash