Fix leaks in mojo::edk::NodeController

Fix leaks in mojo::edk::NodeController

There are a few instances where the broker process (e.g. the browser in
process Chrome) tracks some state -- including outgoing messages --
pertaining to a client process connection. In some cases this tracked data
is not cleaned up once the client process is disconnected. This fixes that.

BUG=704938
Review-Url: https://codereview.chromium.org/2780433003
Cr-Commit-Position: refs/heads/master@{#460001}
(cherry picked from commit 69726f4ba3947fd4ddbfb07fd9f1a596289cdae9)

Review-Url: https://codereview.chromium.org/2784773002 .
Cr-Commit-Position: refs/branch-heads/3029@{#471}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/97716adf5756137e3dfde3526e3d5007e75988a6

[Ken Rockot(use gerrit already), 2017-03-29 05:56:18]

Description was changed from

==========
Fix leaks in mojo::edk::NodeController

There are a few instances where the broker process (e.g. the browser in
process Chrome) tracks some state -- including outgoing messages --
pertaining to a client process connection. In some cases this tracked data
is not cleaned up once the client process is disconnected. This fixes that.

BUG=704938

Review-Url: https://codereview.chromium.org/2780433003
Cr-Commit-Position: refs/heads/master@{#460001}
(cherry picked from commit 69726f4ba3947fd4ddbfb07fd9f1a596289cdae9)
==========

to

==========
Fix leaks in mojo::edk::NodeController

There are a few instances where the broker process (e.g. the browser in
process Chrome) tracks some state -- including outgoing messages --
pertaining to a client process connection. In some cases this tracked data
is not cleaned up once the client process is disconnected. This fixes that.

BUG=704938

Review-Url: https://codereview.chromium.org/2780433003
Cr-Commit-Position: refs/heads/master@{#460001}
(cherry picked from commit 69726f4ba3947fd4ddbfb07fd9f1a596289cdae9)

Review-Url: https://codereview.chromium.org/2784773002 .
Cr-Commit-Position: refs/branch-heads/3029@{#471}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/97716adf5756137e3dfde3526e3d...
==========

[Ken Rockot(use gerrit already), 2017-03-29 05:56:19]

Committed patchset #1 (id:1) manually as
97716adf5756137e3dfde3526e3d5007e75988a6.