Forward declare lsan symbol instead of including

A better fix would be https://chromium-review.googlesource.com/c/chromium/src/+/3963457

Change-Id: I2c8ef6b49e929edd654d064849be531ec8089f62
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/592962
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: George Wright <wrightgeorge@google.com>
1 file changed