Re-land: "Use a token to initialise ChannelMojo and MojoApplication everywhere."

content/common/in_process_child_thread_params.cc

Index: content/common/in_process_child_thread_params.cc
diff --git a/content/common/in_process_child_thread_params.cc b/content/common/in_process_child_thread_params.cc
index 25162b7cddc7ae814963bc5af161e0a03f758857..47e0fd9404a7166d6aa977720ea3c733b059c4eb 100644
--- a/content/common/in_process_child_thread_params.cc
+++ b/content/common/in_process_child_thread_params.cc
@@ -9,9 +9,9 @@ namespace content {
 InProcessChildThreadParams::InProcessChildThreadParams(
     const std::string& channel_name,
     scoped_refptr<base::SequencedTaskRunner> io_runner,
-    mojo::MessagePipeHandle handle,
+    const std::string& ipc_token,
     const std::string& application_token)
-    : channel_name_(channel_name), io_runner_(io_runner), handle_(handle),
+    : channel_name_(channel_name), io_runner_(io_runner), ipc_token_(ipc_token),
       application_token_(application_token) {}
 
 InProcessChildThreadParams::InProcessChildThreadParams(