[mojo-edk] Add some buffer checks and fix UAF on NodeChannel

[mojo-edk] Add some buffer checks and fix UAF on NodeChannel

Adds message sanity checks at the dispatcher layer for
message and data pipes.

Also eliminates potential UAFs on NodeChannel by ensuring
it stays alive through any delegate calls which might have
otherwise deleted it.

BUG=613698
Review-Url: https://codereview.chromium.org/2004763002
Cr-Commit-Position: refs/heads/master@{#395373}
(cherry picked from commit 99a83d5bc1df0c4d6d660dedf45c9b0e14a9df3f)

Committed: https://chromium.googlesource.com/chromium/src/+/76fe408535f6fb2323f366fd2cc1d4d925863a72

[Ken Rockot(use gerrit already), 2016-06-03 19:06:55]

Description was changed from

==========
[mojo-edk] Add some buffer checks and fix UAF on NodeChannel

Adds message sanity checks at the dispatcher layer for
message and data pipes.

Also eliminates potential UAFs on NodeChannel by ensuring
it stays alive through any delegate calls which might have
otherwise deleted it.

BUG=613698

Review-Url: https://codereview.chromium.org/2004763002
Cr-Commit-Position: refs/heads/master@{#395373}
(cherry picked from commit 99a83d5bc1df0c4d6d660dedf45c9b0e14a9df3f)
==========

to

==========
[mojo-edk] Add some buffer checks and fix UAF on NodeChannel

Adds message sanity checks at the dispatcher layer for
message and data pipes.

Also eliminates potential UAFs on NodeChannel by ensuring
it stays alive through any delegate calls which might have
otherwise deleted it.

BUG=613698

Review-Url: https://codereview.chromium.org/2004763002
Cr-Commit-Position: refs/heads/master@{#395373}
(cherry picked from commit 99a83d5bc1df0c4d6d660dedf45c9b0e14a9df3f)

Committed:
https://chromium.googlesource.com/chromium/src/+/76fe408535f6fb2323f366fd2cc1...
==========

[Ken Rockot(use gerrit already), 2016-06-03 19:06:57]

Committed patchset #1 (id:1) manually as
76fe408535f6fb2323f366fd2cc1d4d925863a72.