Reports component updater download metrics in the case of BITS errors

BUG=337937

Review URL: https://codereview.chromium.org/145133016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247074 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247074
Mojo: Delete unused code in Connector to support non-blocking MojoWriteMessage

Review URL: https://codereview.chromium.org/145133020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247075 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247075