Mojo EDK: Add safe process connection API

content/browser/browser_child_process_host_impl.h

Index: content/browser/browser_child_process_host_impl.h
diff --git a/content/browser/browser_child_process_host_impl.h b/content/browser/browser_child_process_host_impl.h
index 0b2906f218221c2632d40767431591ef134c11f6..3c78e6aafea658430910282e6012aecba7140ee6 100644
--- a/content/browser/browser_child_process_host_impl.h
+++ b/content/browser/browser_child_process_host_impl.h
@@ -22,6 +22,7 @@
 #include "content/public/browser/browser_child_process_host.h"
 #include "content/public/browser/child_process_data.h"
 #include "content/public/common/child_process_host_delegate.h"
+#include "mojo/edk/embedder/pending_process_connection.h"
 
 #if defined(OS_WIN)
 #include "base/win/object_watcher.h"
@@ -156,7 +157,7 @@ class CONTENT_EXPORT BrowserChildProcessHostImpl
   BrowserChildProcessHostDelegate* delegate_;
   std::unique_ptr<ChildProcessHost> child_process_host_;
 
-  const std::string child_token_;
+  std::unique_ptr<mojo::edk::PendingProcessConnection> pending_connection_;
   std::unique_ptr<ChildConnection> child_connection_;
 
   std::unique_ptr<ChildProcessLauncher> child_process_;