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A Cast Streaming Session can have subsequent offer messages following
the initial offer. This CL ignores subsequent offer messages to
prevent a browser crash.

Bug: 1116185
Change-Id: Id41b7012d5669996ba81ed9e416ceaf7d1f60b8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357675
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Auto-Submit: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798290}