Update V8 to version 4.2.54 (based on bfe7f4af141da71aefd3af5b0733d1cb27281cf6).

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/901153008

Cr-Commit-Position: refs/heads/master@{#314977}

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': '1df4e336884305d62440e0267993fc65e6051b4e',
+  'v8_revision': '0b77578a0f939b7fdd738b740a0560e6c6dd7379',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling WebRTC
   # and V8 without interference from each other.