Pepper: SelLdrLauncherChrome cleanup.

The indirection provided by SelLdrLauncherChrome::Start() isn't much help.
Instead, we just expose the channel so that ServiceRuntime can pass it to
LaunchSelLdr directly.

BUG=239656

Review URL: https://codereview.chromium.org/360743002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@280686 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed