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initWithFactory: is clumsy and makes classes difficult to mock out in tests. By keeping methods on the factory, we can simply mock out the factory's methods instead. We can consider adding regular Obj-C like ctors if we move to making the factory a singleton, but that requires further discussion. BUG= R=haysc@webrtc.org, hjon@webrtc.org Review URL: https://codereview.webrtc.org/1820193002 . Cr-Commit-Position: refs/heads/master@{#12089}