DEPS.xwalk: Roll v8-crosswalk (f2bc708 -> 825a59c)

825a59c Merge pull request #64 from halton/out-of-range-compare
b16ccb6 Merge pull request #63 from huningxin/m39-load-store-pr
8352127 [Backport] Fix clang++ warnings on -Wtautological-constant-out-of-range-compare
96bb068 [SIMD.js] Implement SIMD128 data load and store APIs