deps: backport 2ad2237 from v8 upstream

Original commit message:

Fix Unhandled ReferenceError in debug-debugger.js

This fixes following exception in Sky on attempt to set a breakpoint
"Unhandled: Uncaught ReferenceError: break_point is not defined"
I think this happens in Sky but not in Chrome because Sky scripts are executed in strict mode.

BUG=None
LOG=N
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/741683002

Cr-Commit-Position: refs/heads/master@{#25415}
deps: backport b593aa8 from v8 upstream

Original commit message:

Enable "strict mode"; for debugger scripts

BUG=v8:3708

Review URL: https://codereview.chromium.org/736583007

Cr-Commit-Position: refs/heads/master@{#25420}
doc: improve dns module's documentation

Make the difference between dns.lookup and other functions even clearer.

PR: #8747
Signed-off-by: Timothy J Fontaine <tjfontaine@gmail.com>
Merge remote-tracking branch 'upstream/v0.10' into v0.10