crush all images
crush all images

Run libdot's imgcrush helper on all our images.  This saves ~7k on the
shipped icons, and over 113k with all the images (like the screenshots).

Change-Id: I63091a1bcc74972080f604292958672e0c75e676
Reviewed-on: https://chromium-review.googlesource.com/1097620
Reviewed-by: Vitaliy Shipitsyn <6f51537d61e46a00bf958b60dbef5b5870c2bf22@google.com>
Tested-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>

chromium/hterm,chromium/hterm,chromium/hterm,chromium/hterm