IDL compiler: remove blank line for void methods

Source/bindings/scripts/code_generator_v8.pm

 # Copyright (C) 2005, 2006 Nikolas Zimmermann <zimmermann@kde.org>
 # Copyright (C) 2006 Anders Carlsson <andersca@mac.com>
 # Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
 # Copyright (C) 2006 Alexey Proskuryakov <ap@webkit.org>
 # Copyright (C) 2006 Apple Computer, Inc.
 # Copyright (C) 2007, 2008, 2009, 2012 Google Inc.
 # Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
 # Copyright (C) Research In Motion Limited 2010. All rights reserved.
 # Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
 # Copyright (C) 2012 Ericsson AB. All rights reserved.
@@ skipping 5172 matching lines @@
     $return .= ".release()" if ($returnIsRef);
 
     my $nativeValue;
     # FIXME: Update for all ScriptWrappables.
     if (IsDOMNodeType($interfaceName)) {
         $nativeValue = NativeToJSValue($function->type, $function->extendedAttributes, $return, $indent, "", "args.Holder()", "args.GetIsolate()", "args", "imp", $forMainWorldSuffix, "return");
     } else {
         $nativeValue = NativeToJSValue($function->type, $function->extendedAttributes, $return, $indent, "", "args.Holder()", "args.GetIsolate()", "args", 0, $forMainWorldSuffix, "return");
     }
 
-    $code .= $nativeValue . "\n";
+    if ($nativeValue) {  # Skip blank line for void return type
+        $code .= $nativeValue . "\n";
+    }
     $code .= $indent . "return;\n";
 
     return $code;
 }
 
 sub GetNativeType
 {
     my $type = shift;
     my $extendedAttributes = shift;
     my $isParameter = shift;
@@ skipping 1029 matching lines @@
     my $interface = shift;
 
     return 1 if $interface->extendedAttributes->{"CustomToV8"};
     return 1 if $interface->extendedAttributes->{"SpecialWrapFor"};
     return 1 if InheritsInterface($interface, "Document");
 
     return 0;
 }
 
 1;