Move AcceleratorController from WmShell to Shell

ash/accelerators/accelerator_controller_unittest.cc

Index: ash/accelerators/accelerator_controller_unittest.cc
diff --git a/ash/accelerators/accelerator_controller_unittest.cc b/ash/accelerators/accelerator_controller_unittest.cc
index fa81be1c474d04ccb1af931cf06cf4ddddd629fe..a449c4ae85ed4551753abe448a3090010f1784d6 100644
--- a/ash/accelerators/accelerator_controller_unittest.cc
+++ b/ash/accelerators/accelerator_controller_unittest.cc
@@ -278,7 +278,7 @@ class AcceleratorControllerTest : public test::AshTestBase {
 };
 
 AcceleratorController* AcceleratorControllerTest::GetController() {
-  return WmShell::Get()->accelerator_controller();
+  return Shell::Get()->accelerator_controller();
 }
 
 // Double press of exit shortcut => exiting