LOG(INFO) tidying in net/

Some deletions, some to VLOG.

R=rsleevi@chromium.org
BUG=322805

Review URL: https://codereview.chromium.org/82913011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237095 0039d316-1c4b-4281-b951-d872f2087c98
Fix crash in TraceLog::UpdateTraceEventDuration()

Because we don't lock when getting event_callback_, there will be
chance that it has been set to NULL in SetEventCallbackDisabled()
in another thread, but category_group_enabled has not been updated yet.

Always check if event_callback is NULL before calling it.

BUG=323016
TBR=nduca
NOTRY=true

Review URL: https://codereview.chromium.org/84963007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237096 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237096
MediaStream API: Cleaning away a bit of dead code
I am removing WemMediaStreamSource::deviceId since it isn't used anymore.

Review URL: https://codereview.chromium.org/85473002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237097 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237097