Bug 1075620 - Switch to GET for fetch to allow caching of links data from redirect. r=ttaubert, a=sledru

Use GET instead of POST and update the fetch endpoint to use %LOCALE%.

--HG--
extra : rebase_source : 690ff2c281871d4565c849c0e58f434fdf381316
Bug 1075640 - Don't return 0-length frames for decoding; add comments about loss handling. r=ehugg, a=sledru

Fixes OpenH264 crashes, especially under extreme packet loss

--HG--
extra : rebase_source : 9a683cc93d0afd4ac0cfb40fb2eac30d2c4bb860
Bug 1075640 - Check for zero length frames in GMP H264 decode. r=jesup, a=sledru

--HG--
extra : rebase_source : 42ad069d1bd87e50bc6719bfb70e656c559806bd