DEPS.xwalk: Roll v8-crosswalk (8baa2b8 -> 402ca0b).

402ca0b Merge pull request #44 from huningxin/simd-jsobject
0fe7e99 Inline the simd128-tag
af33544 Fix the presubmit step
97783aa Inline all SIMD operations and optimize the SIMD arrays load and
        store.
adeeda9 Change Float32x4, Float64x2 and Int32x4 to JSObject.
a89309d Introduce Float32x4, Float64x2, Int32x4, Float32x4Array,
        Float64x2Array and Int32x4Array data types, implement the SIMD
        operations on the Float32x4, Float64x2 and Int32x4 with C++
        runtime functions and implement Float32x4Array, Float64x2Array
        and Int32x4Array element loading and storing.

BUG=XWALK-2185
Merge pull request #2264 from rakuco/roll-v8-xwalk

DEPS.xwalk: Roll v8-crosswalk (8baa2b8 -> 402ca0b).