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These functions operate directly on the packet masks, and are thus not directly involved in the FEC encoding/decoding operation. The ::internal namespace is used for packet mask-related functions, and will be renamed later on. This CL should have no impact on functionality or performance. BUG=webrtc:5654 Review-Url: https://codereview.webrtc.org/2269893002 Cr-Commit-Position: refs/heads/master@{#13914}