Roll gn 8b9e025d4d..0fbf0789d9 (r554932:r555198)

  9e71c94d75e6 Show error with gn desc when no matches are made
  3d36fd0d000c Make `gn refs out/foo //out/foo/gn` work.

TBR=brettw@chromium.org

Change-Id: I20e59f46fb245563eb0b4d48914560adcf3b7cf8
3 files changed