trunks: update the libchrome version to 307740

BUG=None
TEST=Build the world
CQ-DEPEND=CL:234450

Change-Id: I4163d40eb35a0916cf669397b8c5056e58adc2cb
Reviewed-on: https://chromium-review.googlesource.com/234700
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Reviewed-by: Alex Deymo <deymo@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
diff --git a/tss/Makefile b/tss/Makefile
index 1f026fd..c771cde 100644
--- a/tss/Makefile
+++ b/tss/Makefile
@@ -19,7 +19,7 @@
 INSTALL_DATA = $(INSTALL) -m 0644
 LIB_DIR ?= /usr/lib
 
-BASE_VER ?= 271506
+BASE_VER ?= 307740
 PC_DEPS = dbus-c++-1 libchrome-$(BASE_VER) libchromeos-$(BASE_VER)
 PC_CFLAGS := $(shell $(PKG_CONFIG) --cflags $(PC_DEPS))
 PC_LIBS := $(shell $(PKG_CONFIG) --libs $(PC_DEPS))