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 <[email protected]> Reviewed-by: Alex Deymo <[email protected]> Commit-Queue: Alex Vakulenko <[email protected]>