[Chromecast] Remove lcwu from OWNERS, TODO; add spang

Bug: none
Change-Id: Ifb24f706c5ba62b529adc8be0c574530f2cb99a5
Reviewed-on: https://chromium-review.googlesource.com/966595Reviewed-by: Stephen Lanham <slan@chromium.org>
Commit-Queue: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543862}

chromecast/OWNERS

 halliwell@chromium.org
-lcwu@chromium.org
 servolk@chromium.org
 slan@chromium.org
 
+# For major changes, please use one of the reviewers above!
+spang@chromium.org
+
 # COMPONENT: Chromecast

chromecast/browser/cast_content_browser_client.cc

@@ -469,7 +469,7 @@ void CastContentBrowserClient::OverrideWebkitPrefs(
     content::RenderViewHost* render_view_host,
     content::WebPreferences* prefs) {
   prefs->allow_scripts_to_close_windows = true;
-  // TODO(lcwu): http://crbug.com/391089. This pref is set to true by default
+  // TODO(halliwell): http://crbug.com/391089. This pref defaults to to true
   // because some content providers such as YouTube use plain http requests
   // to retrieve media data chunks while running in a https page. This pref
   // should be disabled once all the content providers are no longer doing that.