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ErrorOr<> makes it easier to return an arbitrary value or an error.
For example, one might:

ErrorOr<std::unique_ptr<int>> Foo() {
  // return a ptr, or a MediaError explaining why not.
}

Change-Id: I819b29c1dcc9ba2512ab709da2ae6b267a24d8b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040374
Commit-Queue: Frank Liberato <liberato@chromium.org>
Reviewed-by: Ted Meyer <tmathmeyer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739144}