Cleanup LSan suppression files.

This file no longer needs to exist after
https://codereview.chromium.org/941433004/ has been landed.

Libyuv never had any LSan suppressions added, so the
file has no purpose.
Also cleanup empty sanitizer_options.gyp file that was added
by mistake.

BUG=
R=fbarchard@google.com

Review URL: https://webrtc-codereview.appspot.com/35299004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1300 16f28f9a-4ce2-e073-06de-1de4eb20be90

tools/lsan/suppressions.txt

-# This is a suppressions file that must exist in order for the Leak Sanitizer
-# tool that runs on the ASan bot to be able to run with the default
-# configuration. More info about LSan on
-# http://www.chromium.org/developers/testing/leaksanitizer
-
-#### Third-party leaks ####
-
-#### Actual bugs in Libyuv code ####
-
-