Remove definition of non-existent method. The private method "CreateDefaultLocalDescription" is defined in the class, but not implemented or used anywhere.
Remove definition of non-existent method.
The private method "CreateDefaultLocalDescription" is defined in the
class, but not implemented or used anywhere.

R=juberti@webrtc.org

Review URL: https://codereview.webrtc.org/1182793004.

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#9493}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 66f920ea57c76e6213ada45ad907872f4fa2e7ee

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