services/shell: Fix running the connection-lost callback.

content/public/common/mojo_shell_connection.h

Index: content/public/common/mojo_shell_connection.h
diff --git a/content/public/common/mojo_shell_connection.h b/content/public/common/mojo_shell_connection.h
index 87209697634b1e1a2b6ec6f72488a11fd66e2f54..fc5e47a6bbbc1e93966f2474a32ab5361b21d9dd 100644
--- a/content/public/common/mojo_shell_connection.h
+++ b/content/public/common/mojo_shell_connection.h
@@ -64,7 +64,9 @@ class CONTENT_EXPORT MojoShellConnection {
   // a shell embedded in the browser process (false).
   virtual bool UsingExternalShell() const = 0;
 
-  // Sets a closure that is called when the connection is lost.
+  // Sets a closure that is called when the connection is lost. Note that
+  // connection may already have been closed, in which case |closure| will be
+  // run immediately before returning from this function.
   virtual void SetConnectionLostClosure(const base::Closure& closure) = 0;
 
   // [De]Register an impl of Listener that will be consulted when the wrapped