Switching scons to read-only copy, and pinning revision (as its dropped out of the source tree).
Switching scons to read-only copy, and pinning revision (as its dropped
out of the source tree).

BUG=None
TEST=None
TBR=sgk

Review URL: http://codereview.chromium.org/5688002
witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp