Mojo EDK: Add safe process connection API

content/common/child_process_host_impl.cc

Index: content/common/child_process_host_impl.cc
diff --git a/content/common/child_process_host_impl.cc b/content/common/child_process_host_impl.cc
index c64d2b71c3ffe8a5759cec1c98dbef314d6bc73b..b65a8cb7783e7b57b81f2b2297007f9532335833 100644
--- a/content/common/child_process_host_impl.cc
+++ b/content/common/child_process_host_impl.cc
@@ -121,16 +121,13 @@ void ChildProcessHostImpl::ForceShutdown() {
 }
 
 std::string ChildProcessHostImpl::CreateChannelMojo(
-    const std::string& child_token) {
+    const mojo::edk::PendingProcessConnection& connection) {
   DCHECK(channel_id_.empty());
-  channel_id_ = mojo::edk::GenerateRandomToken();
-  mojo::ScopedMessagePipeHandle host_handle =
-      mojo::edk::CreateParentMessagePipe(channel_id_, child_token);
-  channel_ = IPC::ChannelMojo::Create(std::move(host_handle),
-                                      IPC::Channel::MODE_SERVER, this);
+  channel_ =
+      IPC::ChannelMojo::Create(connection.CreateMessagePipe(&channel_id_),
+                               IPC::Channel::MODE_SERVER, this);
   if (!channel_ || !InitChannel())
     return std::string();
-
   return channel_id_;
 }