[Qt][WK1] navigator.plugins shows too few entries.

https://bugs.webkit.org/show_bug.cgi?id=119332

Reviewed by Jocelyn Turcotte.

Based on input by Choon Sik Cho.

PlatformStrategiesQt::getPluginInfo was using the
WTF::Vector::resize method wrongly.

This patch removes the call to Vector::resize as
Vector::append will take care of increasing capacity
if needed.

* WebCoreSupport/PlatformStrategiesQt.cpp:
(PlatformStrategiesQt::getPluginInfo):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@153517 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Task-Number: QTBUG-30141
Change-Id: Ic6dd9d6402251d5243e6793dd0d1170c685425d3
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>