Revert 55507 - Start chromoting host in the service process though a method call

This change exposes method calls to configure the chromoting host and allow
it to be started from a method.

This will allow us to use IPC message to start the chromoting host.

TEST=unit_tests --gtest_filter=ServiceProcess*
BUG=50243, 50244

Review URL: http://codereview.chromium.org/3084024

TBR=hclam@chromium.org
Review URL: http://codereview.chromium.org/3110004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@55525 0039d316-1c4b-4281-b951-d872f2087c98