Roll lss_revision 63f24c8221..e6527b0cd4

Changed dependencies:
* src/third_party/lss: https://chromium.googlesource.com/linux-syscall-support.git/+log/63f24c8221..e6527b0cd4

TBR=phoglund@chromium.org
BUG=libyuv:768
TEST=None

Change-Id: Ieecd96f78c841b6defed0105430b2a09168b7b54
Reviewed-on: https://chromium-review.googlesource.com/849258Reviewed-by: Frank Barchard <fbarchard@chromium.org>

DEPS

@@ -5,7 +5,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling lss
   # and whatever else without interference from each other.
-  'lss_revision': '63f24c8221a229f677d26ebe8f3d1528a9d787ac',
+  'lss_revision': 'e6527b0cd469e3ff5764785dadcb39bf7d787154',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling catapult
   # and whatever else without interference from each other.