review 8.0 fix for RT-34663: pick more appropriate defaults for vram pool sizes

[Jim Graham]

Hi Lisa,

Here are the changes we discussed.  Note that I found the settings at 
different lines in the embedded configuration files than you indicated, 
but hopefully I modified all of the required platforms correctly...

Jira: https://javafx-jira.kenai.com/browse/RT-34663
webrev: http://cr.openjdk.java.net/~flar/RT-34663/webrev.00/

                        ...jim