DEPS.xwalk: Roll v8-crosswalk (03d8b6c -> 35e0d97)

35e0d97 Merge pull request #59 from eleskine/master
089ec67 Extend CPU profiler with mapping ticks to source lines
Merge pull request #2593 from eleskine/eleskine-crosswalk-10

DEPS.xwalk: Roll v8-crosswalk (03d8b6c -> 35e0d97)