Removed backloader component extension.

BUG=350446
TEST=none
TBR=sky

Review URL: https://codereview.chromium.org/191233002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255770 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255770
Simple HTTP server for Chromoting End-to-End tests

BUG=341526

Review URL: https://codereview.chromium.org/180273015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255771 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255771