Re-land r136486 (reverted in r136500).
Delete DownloadRateMonitor since it's never worked right.
(and it complicates other things I want to do)

BUG=73609
TBR=scherkus


Review URL: https://chromiumcodereview.appspot.com/10392048

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@136641 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed