Fix some uninitialized variables in convert_legacy_video_factory
Fix some uninitialized variables in convert_legacy_video_factory

This is causing compilation failure on Chrome on Windows using MSVC
64bits.

TBR=andersc@webrtc.org

Bug: chromium:787192
Change-Id: If82290a9d7373385de4820b34f2c7dc9225c3d95
Reviewed-on: https://webrtc-review.googlesource.com/24981
Reviewed-by: Magnus Jedvert <9507adee858471ab168c339dc72b814b168c081b@webrtc.org>
Commit-Queue: Magnus Jedvert <9507adee858471ab168c339dc72b814b168c081b@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#20821}
TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc