Fixing a crash in our native messaging host binaries

Fixing a crash in our native messaging host binaries

This CL fixes a crash which can occur if the native messaging pipeline is
torn down immediately after a message is sent.  The LogMessageHandler class
will run a messaging delegate and then attempt to update a member variable.
If the instance is destroyed, then an AV will occur.

The fix is to check if the instance is still alive using a WeakPtr skip the
member variable assignment if it has been torn down.

BUG=718871
Review-Url: https://codereview.chromium.org/2857983008
Cr-Commit-Position: refs/heads/master@{#469646}
(cherry picked from commit e0ca3279b3b7ba5053a56f03fd57f7feb03d93ba)

Review-Url: https://codereview.chromium.org/2867623002 .
Cr-Commit-Position: refs/branch-heads/3071@{#434}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/13d77cbc3998a37f2a8e895831af67e7c0bf3752

[joedow, 2017-05-06 23:12:55]

Description was changed from

==========
Fixing a crash in our native messaging host binaries

This CL fixes a crash which can occur if the native messaging pipeline is
torn down immediately after a message is sent.  The LogMessageHandler class
will run a messaging delegate and then attempt to update a member variable.
If the instance is destroyed, then an AV will occur.

The fix is to check if the instance is still alive using a WeakPtr skip the
member variable assignment if it has been torn down.

BUG=718871

Review-Url: https://codereview.chromium.org/2857983008
Cr-Commit-Position: refs/heads/master@{#469646}
(cherry picked from commit e0ca3279b3b7ba5053a56f03fd57f7feb03d93ba)
==========

to

==========
Fixing a crash in our native messaging host binaries

This CL fixes a crash which can occur if the native messaging pipeline is
torn down immediately after a message is sent.  The LogMessageHandler class
will run a messaging delegate and then attempt to update a member variable.
If the instance is destroyed, then an AV will occur.

The fix is to check if the instance is still alive using a WeakPtr skip the
member variable assignment if it has been torn down.

BUG=718871

Review-Url: https://codereview.chromium.org/2857983008
Cr-Commit-Position: refs/heads/master@{#469646}
(cherry picked from commit e0ca3279b3b7ba5053a56f03fd57f7feb03d93ba)

Review-Url: https://codereview.chromium.org/2867623002 .
Cr-Commit-Position: refs/branch-heads/3071@{#434}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/13d77cbc3998a37f2a8e895831af...
==========

[joedow, 2017-05-06 23:12:56]

Committed patchset #1 (id:1) manually as
13d77cbc3998a37f2a8e895831af67e7c0bf3752.