Update to build against libchrome-242728.

BUG=chromium:341521
CQ-DEPEND=CL:185713
TEST=`FEATURES=test emerge-{x86,amd64,arm}-generic touch_noise_filter`

Change-Id: I6760bef9e8e5e358fa9c5c01863dee1ce5a8ec8f
Reviewed-on: https://chromium-review.googlesource.com/185730
Tested-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
diff --git a/Makefile b/Makefile
index 16fd595..6d011ef 100644
--- a/Makefile
+++ b/Makefile
@@ -44,7 +44,7 @@
 	-I..
 
 PKG_CONFIG ?= pkg-config
-BASE_VER ?= 180609
+BASE_VER ?= 242728
 PC_DEPS += libchrome-$(BASE_VER)
 PC_CFLAGS := $(shell $(PKG_CONFIG) --cflags $(PC_DEPS))
 PC_LIBS := $(shell $(PKG_CONFIG) --libs $(PC_DEPS))