Revert "gyp: use all processors instead of hard-coded 8."
Revert "gyp: use all processors instead of hard-coded 8."

This reverts commit 56a70c5641bbb01683dfeb7aa8a65800a00fb936.

The change made bug 112 trigger on a trybot since we used
fewer processes, making bug 112 easier to trigger. The
value of this patch is not big enough to fuss around.

BUG=
R=torne@chromium.org

Review URL: https://codereview.chromium.org/265003004

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@1911 78cadc50-ecff-11dd-a971-7dbc132099af

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