Moved ppapi revision to the vars list for easier maintenance
Moved ppapi revision to the vars list for easier maintenance

It will be easier to pick out the current ppapi revision if
it is maintained in the Vars section instead of being inlined
in the deps section

BUG=None
TEST=Trybots

Review URL: http://codereview.chromium.org/7342013

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@6035 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client