Update comment on IOThread to point people to the right place if they

want some of the functionality that used to be there.

BUG=98716

Review URL: http://codereview.chromium.org/8905010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@114288 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/io_thread.h

@@ -49,6 +49,10 @@ class URLSecurityManager;
 
 // Contains state associated with, initialized and cleaned up on, and
 // primarily used on, the IO thread.
+//
+// If you are looking to interact with the IO thread (e.g. post tasks
+// to it or check if it is the current thread), see
+// content::BrowserThread.
 class IOThread : public content::BrowserThreadDelegate {
  public:
   struct Globals {