[GTK] Annotations for WebResource.get_data produce wrong signature in Vala binding
https://bugs.webkit.org/show_bug.cgi?id=134476

Patch by Evan Nemerson <evan@nemerson.com> on 2014-07-01
Reviewed by Carlos Garcia Campos.

* UIProcess/API/gtk/WebKitWebResource.cpp: Add array length and
element-type annotations to return value of webkit_web_resource_get_data_finish().

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@170633 268f45cc-cd09-0410-ab3c-d52691b4dbfc