Fix the sysroot path in gyp
Fix the sysroot path in gyp

paulcbetts/libchromiumcontent,synaptek/libchromiumcontent,synaptek/libchromiumcontent,electron/libchromiumcontent,zhanggyb/libchromiumcontent,electron/libchromiumcontent,brave/libchromiumcontent,atom/libchromiumcontent,bbondy/libchromiumcontent,bbondy/libchromiumcontent,brave/libchromiumcontent,atom/libchromiumcontent,eric-seekas/libchromiumcontent,paulcbetts/libchromiumcontent,zhanggyb/libchromiumcontent,eric-seekas/libchromiumcontent