Remove ShelfItemDelegate::IsDraggable; check for app list button.

ash/common/test/test_shelf_item_delegate.cc

Index: ash/common/test/test_shelf_item_delegate.cc
diff --git a/ash/common/test/test_shelf_item_delegate.cc b/ash/common/test/test_shelf_item_delegate.cc
index 985a705f63e9b84af11f76fda662b9aa0282f8e2..e7d9cca213e1572a752efc1cdc07104bc5e8730a 100644
--- a/ash/common/test/test_shelf_item_delegate.cc
+++ b/ash/common/test/test_shelf_item_delegate.cc
@@ -10,7 +10,7 @@ namespace ash {
 namespace test {
 
 TestShelfItemDelegate::TestShelfItemDelegate(WmWindow* window)
-    : window_(window), is_draggable_(true) {}
+    : window_(window) {}
 
 TestShelfItemDelegate::~TestShelfItemDelegate() {}
 
@@ -34,10 +34,6 @@ ShelfMenuModel* TestShelfItemDelegate::CreateApplicationMenu(int event_flags) {
   return nullptr;
 }
 
-bool TestShelfItemDelegate::IsDraggable() {
-  return is_draggable_;
-}
-
 bool TestShelfItemDelegate::CanPin() const {
   return true;
 }