Revert "Update mojo sdk to rev 8d45c89c30b230843c5bd6dd0693a555750946c0"

third_party/mojo/src/mojo/edk/system/channel.h

Index: third_party/mojo/src/mojo/edk/system/channel.h
diff --git a/third_party/mojo/src/mojo/edk/system/channel.h b/third_party/mojo/src/mojo/edk/system/channel.h
index 93ba87ae95743ec56b7b4ec91a1a4c766a8f1c89..396185908dd48b1f989425198bb61ac00a66e6f8 100644
--- a/third_party/mojo/src/mojo/edk/system/channel.h
+++ b/third_party/mojo/src/mojo/edk/system/channel.h
@@ -54,7 +54,8 @@ class MOJO_SYSTEM_IMPL_EXPORT Channel
     : public base::RefCountedThreadSafe<Channel>,
       public RawChannel::Delegate {
  public:
-  // |platform_support| must remain alive until after |Shutdown()| is called.
+  // |platform_support| (typically owned by |Core|) must remain alive until
+  // after |Shutdown()| is called.
   explicit Channel(embedder::PlatformSupport* platform_support);
 
   // This must be called on the creation thread before any other methods are
@@ -64,9 +65,7 @@ class MOJO_SYSTEM_IMPL_EXPORT Channel
 
   // Sets the channel manager associated with this channel. This should be set
   // at most once and only called before |WillShutdownSoon()| (and
-  // |Shutdown()|). (This is called by the channel manager when adding a
-  // channel; this should not be called before the channel is managed by the
-  // channel manager.)
+  // |Shutdown()|).
   void SetChannelManager(ChannelManager* channel_manager);
 
   // This must be called on the creation thread before destruction (which can