[WX] Make FontPlatformData::m_size private
https://bugs.webkit.org/show_bug.cgi?id=72214

Reviewed by Andreas Kling.

Also change the order of member variables to match
the order in the constructor to fix many warnings.

* platform/graphics/wx/FontPlatformData.h:

git-svn-id: svn://svn.chromium.org/blink/trunk@100106 bbb929c8-8fbe-4397-9dbb-9b2b20218538