Enable new-virtual-keyboard-behavior flag by default.

ash/shelf/shelf_layout_manager.cc

Index: ash/shelf/shelf_layout_manager.cc
diff --git a/ash/shelf/shelf_layout_manager.cc b/ash/shelf/shelf_layout_manager.cc
index 0ab2ec305b1294468aca9f80cf403c63810aeac2..d7d10ce08ee2bc87007fb2c6150e67125c2a358b 100644
--- a/ash/shelf/shelf_layout_manager.cc
+++ b/ash/shelf/shelf_layout_manager.cc
@@ -433,9 +433,10 @@ void ShelfLayoutManager::OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) {
   // If new window behavior flag enabled and in non-sticky mode, do not change
   // the work area.
   bool change_work_area =
-      (!base::CommandLine::ForCurrentProcess()->HasSwitch(
-           ::switches::kUseNewVirtualKeyboardBehavior) ||
-       keyboard::KeyboardController::GetInstance()->keyboard_locked());
+      (base::CommandLine::ForCurrentProcess()->HasSwitch(
+           ::switches::kDisableNewVirtualKeyboardBehavior) ||
+       (keyboard::KeyboardController::GetInstance() &&
+        keyboard::KeyboardController::GetInstance()->keyboard_locked()));
 
   keyboard_bounds_ = new_bounds;
   LayoutShelfAndUpdateBounds(change_work_area);