Revert 247164 "Implement browser-side logging to WebRtc log"

Need to revert this because it's causing crashes on Canary.

BUG=338848


> Implement browser-side logging to WebRtc log
> 
> This adds a logging callback to RenderProcessHost and also adds logging
> for device enumeration in the browser process.
> 
> BUG=332261
> 
> Review URL: https://codereview.chromium.org/140843007

TBR=vrk@chromium.org

Review URL: https://codereview.chromium.org/132233058

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247548 0039d316-1c4b-4281-b951-d872f2087c98
Trying to reland the patch originally commited here:
https://codereview.chromium.org/79673003
and reverted here:
https://codereview.chromium.org/120323002/

I think the build failure was because "browser" target should depend
on "cast_channel_proto" so that cast_channel.pb.h is built before
browser target is built.

Review URL: https://codereview.chromium.org/132763002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247549 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247548
Exclude about:network strings from non-chromeos builds.

chrome://network is only available on ChromeOS so other builds
should not include the strings for it.

BUG=326023
NOTRY=true

Review URL: https://codereview.chromium.org/136683007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247550 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247550