Generalize FEC unit tests and rename GenerateFec.
- Rename GenerateFec -> EncodeFec in ForwardErrorCorrection. This naming
is more consistent with DecodeFec.
- Add appropriate using directives, to reduce clutter in tests.
- Move ConstructMediaPackets to fec_test_helper.{h,cc}. This will help
future tests of ULPFEC/FlexFEC header formatters.
- Generalize tests in rtp_fec_unittest.cc to typed tests. This will help
testing ForwardErrorCorrection with both ULPFEC and FlexFEC.
This CL should not impact functionality or performance.
BUG=webrtc:5654
Review-Url: https://codereview.webrtc.org/2267393002
Cr-Commit-Position: refs/heads/master@{#14314}
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