[mojo-edk] Remove ChildProcessLaunched that returns a pipe handle.

components/arc/arc_bridge_bootstrap.cc

Index: components/arc/arc_bridge_bootstrap.cc
diff --git a/components/arc/arc_bridge_bootstrap.cc b/components/arc/arc_bridge_bootstrap.cc
index 58118835cc6e19c2607cf83840651154075fbbf3..d0eed62488867786d4bb731f9c421e985462070b 100644
--- a/components/arc/arc_bridge_bootstrap.cc
+++ b/components/arc/arc_bridge_bootstrap.cc
@@ -253,11 +253,13 @@ base::ScopedFD ArcBridgeBootstrapImpl::AcceptInstanceConnection(
 
   // Hardcode pid 0 since it is unused in mojo.
   const base::ProcessHandle kUnusedChildProcessHandle = 0;
-  mojo::edk::ScopedPlatformHandle child_handle =
-      mojo::edk::ChildProcessLaunched(kUnusedChildProcessHandle);
+  mojo::edk::PlatformChannelPair channel_pair;
+  mojo::edk::ChildProcessLaunched(kUnusedChildProcessHandle,
+                                  channel_pair.PassServerHandle());
 
   mojo::edk::ScopedPlatformHandleVectorPtr handles(
-      new mojo::edk::PlatformHandleVector{child_handle.release()});
+      new mojo::edk::PlatformHandleVector{
+          channel_pair.PassClientHandle().release()});
 
   struct iovec iov = {const_cast<char*>(""), 1};
   ssize_t result = mojo::edk::PlatformChannelSendmsgWithHandles(