deadbeef fc1af01557 Relanding: Fixing crash that can occur if signal is modified while firing.
The crash occurs if a slot causes the very next slot in iteration order
to be disconnected.

Relanding after fixing a race condition that this CL revealed. Previously
the race resulted in an invalidated iterator, but now it will result in the
iterator being modified, so TSan catches it.

BUG=webrtc:7527

Review-Url: https://codereview.webrtc.org/2846593005
Cr-Original-Commit-Position: refs/heads/master@{#17943}
Committed: 961c2adf1e
Review-Url: https://codereview.webrtc.org/2846593005
Cr-Commit-Position: refs/heads/master@{#17965}
2017-05-02 05:24:20 +00:00
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