Revert "Update webrtc&libjingle 6774:6799."

Revert "Update webrtc&libjingle 6774:6799."

This reverts commit bf45dff0ca703e5ad3bb6c6754ebdcb0c1b1296a.
(https://codereview.chromium.org/429253003)

Broke sizes on Linux

http://build.chromium.org/p/chromium/builders/Linux/builds/51786

https://code.google.com/p/webrtc/source/browse/trunk/webrtc/base/linux.cc
defines static std::string lsb_release_string; among other things

It's guarded in WEBRTC_CHROMIUM_BUILDs. Maybe it should be
WEBRTC_CHROMIUM_BUILD.

BUG=NONE
TBR=darin@chromium.org, hclam@chromium.org, jochen@chromium.org, palmer@chromium.org, sergeyu@chromium.org, wez@chromium.org, ronghuawu@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/435823002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@286914 0039d316-1c4b-4281-b951-d872f2087c98