[Binding] Remove "super-compact call" generation for regular attribute getter/setter

Code generator generate "super-compact call" for shortcut in some special case,
but generated code is almost same without the routine.
This patch remove the shortcut routine.

Also remove unnecessary "return;".

R=haraken@chromium.org
BUG=239771
TEST=TestInterfaceImplementedAs.idl
     TestTypedefs.idl
     TestInterface.idl
     TestSerializedScriptValueInterface.idl
     TestObject.idl

Review URL: https://chromiumcodereview.appspot.com/18507002

git-svn-id: svn://svn.chromium.org/blink/trunk@153418 bbb929c8-8fbe-4397-9dbb-9b2b20218538