Update comments in socket_dispatcher.h.

content/renderer/p2p/socket_dispatcher.h

Index: content/renderer/p2p/socket_dispatcher.h
diff --git a/content/renderer/p2p/socket_dispatcher.h b/content/renderer/p2p/socket_dispatcher.h
index eb81de39d220f200ac621b7f3eea08dfcc13e569..8cebd5190f221f9eb26568fb7e6ac149482da7f3 100644
--- a/content/renderer/p2p/socket_dispatcher.h
+++ b/content/renderer/p2p/socket_dispatcher.h
@@ -15,6 +15,8 @@
 //            v                  IPC              v
 //  P2PSocketDispatcherHost  <--------->  P2PSocketDispatcher
 //
+// P2PSocketDispatcher receives and dispatches messages on the
+// renderer thread.
 
 #ifndef CONTENT_RENDERER_P2P_SOCKET_DISPATCHER_H_
 #define CONTENT_RENDERER_P2P_SOCKET_DISPATCHER_H_
@@ -50,9 +52,6 @@ namespace content {
 class P2PHostAddressRequest;
 class P2PSocketClient;
 
-// P2PSocketDispatcher works on the renderer thread. It dispatches all
-// messages on that thread, and all its methods must be called on the
-// same thread.
 class CONTENT_EXPORT P2PSocketDispatcher : public content::RenderViewObserver {
  public:
   explicit P2PSocketDispatcher(RenderViewImpl* render_view);
@@ -60,11 +59,13 @@ class CONTENT_EXPORT P2PSocketDispatcher : public content::RenderViewObserver {
 
   // Add a new network list observer. Each observer is called
   // immidiately after it is registered and then later whenever
-  // network configuration changes.
+  // network configuration changes. Can be called on any thread. The
+  // observer is always called on the thread it was added.
   void AddNetworkListObserver(
       webkit_glue::NetworkListObserver* network_list_observer);
 
-  // Removes network list observer.
+  // Removes network list observer. Must be called on the thread on
+  // which the observer was added.
   void RemoveNetworkListObserver(
       webkit_glue::NetworkListObserver* network_list_observer);