Remove unused flag 'kDisableSmartVirtualKeyboard' and associated code.

ash/virtual_keyboard_controller.cc

Index: ash/virtual_keyboard_controller.cc
diff --git a/ash/virtual_keyboard_controller.cc b/ash/virtual_keyboard_controller.cc
index 8899e1baa1d8ecd0755b35c3ceedefff573816bc..d36e8e2cbd608d931c04069dba42d8d783c11bd6 100644
--- a/ash/virtual_keyboard_controller.cc
+++ b/ash/virtual_keyboard_controller.cc
@@ -29,11 +29,8 @@ namespace {
 
 // Checks whether smart deployment is enabled.
 bool IsSmartVirtualKeyboardEnabled() {
-  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-          keyboard::switches::kEnableVirtualKeyboard)) {
-    return false;
-  }
-  return keyboard::IsSmartDeployEnabled();
+  return !base::CommandLine::ForCurrentProcess()->HasSwitch(
+      keyboard::switches::kEnableVirtualKeyboard);
 }
 
 void MoveKeyboardToDisplayInternal(const int64_t display_id) {