Fails build on Clang because Caps.cpp defines a constructor
initializer out-of-order with the member variable order in the
header.

BUG=angleproject:1186

This reverts commit 7432321e.

Change-Id: I2840d02e6e7b6bbc76eb495b5462c43116a5c4a6
Reviewed-on: https://chromium-review.googlesource.com/308800Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>