Update V8 to version 4.2.47 (based on d166735d0a7b0a20c48b03e5af826a63c3da0e46).

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/891183004

Cr-Commit-Position: refs/heads/master@{#314296}

DEPS

@@ -47,7 +47,7 @@ vars = {
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.
   'v8_branch': 'trunk',
-  'v8_revision': '6f9b9ca3ffc339c6d2cc441cd2b090bdd67adcef',
+  'v8_revision': '224d14897d9b7df09e08a94e4cbc13feb339346d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling WebRTC
   # and V8 without interference from each other.