Update V8 to version 5.0.48.

Summary of changes available at:
https://chromium.googlesource.com/v8/v8/+log/96f1766e..7dc32c84

Please follow these instructions for assigning/CC'ing issues:
https://github.com/v8/v8/wiki/Triaging%20issues

Please close rolling in case of a roll revert:
https://v8-roll.appspot.com/
This only works with a Google account.

TBR=hablich@chromium.org,machenbach@chromium.org,yangguo@chromium.org,vogelheim@chromium.org

Review URL: https://codereview.chromium.org/1718933002

Cr-Commit-Position: refs/heads/master@{#376664}

DEPS

diff --git a/DEPS b/DEPS
index ba7cfc62..c6f930a 100644
--- a/DEPS
+++ b/DEPS
@@ -43,7 +43,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.
-  'v8_revision': '96f1766e51a8bd9428b876de118f03c762f1a591',
+  'v8_revision': '7dc32c84c10ce2592e3e346a6deb312810cc8751',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling swarming_client
   # and whatever else without interference from each other.