ninja: Don't replace spaces with '_' in action / rule descriptions.
ninja: Don't replace spaces with '_' in action / rule descriptions.

I broke this in r1484. No behavior change, just looks nicer.
TBR=scottmg
Review URL: https://chromiumcodereview.appspot.com/10891018
old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google