Revert 284322 "Allow EmbedRoot to be called multiple times."

trunk/src/mojo/services/public/interfaces/view_manager/view_manager.mojom

Index: trunk/src/mojo/services/public/interfaces/view_manager/view_manager.mojom
===================================================================
--- trunk/src/mojo/services/public/interfaces/view_manager/view_manager.mojom	(revision 284322)
+++ trunk/src/mojo/services/public/interfaces/view_manager/view_manager.mojom	(working copy)
@@ -22,17 +22,10 @@
   ILLEGAL_ARGUMENT,
 };
 
-// ViewManagerInitService is used to grant an application a connection to the
-// ViewManager by embedding it at an approriate Node.
+// ViewManagerInitService is responsible for launching the client that controls
+// the root node. mojo::view_manager returns an instance of this. All other
+// connections are established by the client this creates.
 interface ViewManagerInitService {
-  // Embed the application @ |url| at an appropriate Node.
-  // The first time this method is called in the lifetime of a View Manager
-  // application instance, the "appropriate Node" is defined as being the
-  // service root Node.
-  // Subsequent times, implementation of this method is delegated to the
-  // application embedded at the service root Node. This application is
-  // typically referred to as the "window manager", and will have a specific
-  // definition of where within its Node hierarchy to embed an unparented URL.
   EmbedRoot(string url) => (bool success);
 };
 
@@ -200,16 +193,8 @@
   //             removed.
   OnFocusChanged(uint32 gained_focus_id, uint32 lost_focus_id);
 
-  // TODO(sky): The following methods represent an interface between the view
-  //            manager and the application embedded at the service root node
-  //            (i.e. the window manager). These methods are not called on
-  //            any other clients. They should be moved to a separate interface
-  //            once support for derived FIFOs is landed.
+  // TODO(sky): move to separate interface when FIFO sorted out.
 
-  // Requests the window manager create a "top level" node embedding |url|.
-  EmbedRoot(string url);
-
-  // Requests the view manager dispatch the event targeted at |view|.
   DispatchOnViewInputEvent(uint32 view, mojo.Event event);
 };