错误： error: '../../build/util/LASTCHANGE.blink', needed by 'gen/webkit_version.h', missing and no known rule to make it
解决：src目录执行两个脚本
./build/util/lastchange.py build/util/LASTCHANGE
./build/util/lastchange.py -s third_party/WebKit/ -o build/util/LASTCHANGE.blink