Revert of Roll webrtc 6905:6948.

Revert of Roll webrtc 6905:6948. (patchset #2 of https://codereview.chromium.org/497463002/)

Reason for revert:
Caused regression in static initializer count:

 # webrtcvideoengine2.cc _GLOBAL__sub_I_webrtcvideoengine2.cc+0x53                                                                                            
  # webrtcvideoengine2.cc _GLOBAL__sub_I_webrtcvideoengine2.cc+0x5a                                                                                            
  # webrtcvideoengine2.cc _GLOBAL__sub_I_webrtcvideoengine2.cc+0x9                                                                                             
  # webrtcvideoengine2.cc __divdi3@plt     

http://build.chromium.org/p/chromium/builders/Linux/builds/52540

Original issue's description:
> Roll webrtc 6905:6948.
> 
> TBR=hclam@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=291082

TBR=hclam@chromium.org,grunell@chromium.org
NOTREECHECKS=true
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=291106

[dewittj, 2014-08-21 16:43:13]

Created Revert of Roll webrtc 6905:6948.

[commit-bot: I haz the power, 2014-08-21 16:49:20]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dewittj@chromium.org/495103003/1

[commit-bot: I haz the power, 2014-08-21 16:59:17]

Committed patchset #1 (1) as 291106