Stale visualize_color_gamut.cpp reference in tools.gyp

TBR=msarett@google.com

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4775

Change-Id: I6ca3379ca9578dc9a7f158a1a01b6a73bf301f17
Reviewed-on: https://skia-review.googlesource.com/4775
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Matt Sarett <msarett@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
1 file changed