Revert "Shrink RuleData by 16 bytes"

This reverts commit 7e234c2b0cfa9704d33eb6d6b5bc11f5f0e0b3d2.

Not materializing these hash values slowed down the loading of the Wall Street
Journal because SelectorFilter::fastRejectSelector is now the top symbol on the
profile. We have some ideas about how to get the memory savings without
regressing performance, which are recorded in
https://code.google.com/p/chromium/issues/detail?id=269120

For the time being, we're just going to revert the original CL to remove the
regression. We can implement the real, ultimate solution in a future CL.

R=esprehn@chromium.org
BUG=255573

Review URL: https://chromiumcodereview.appspot.com/22424005

git-svn-id: svn://svn.chromium.org/blink/trunk@155652 bbb929c8-8fbe-4397-9dbb-9b2b20218538