Revert of Move content's shell connections to the IO thread

content/browser/utility_process_host_impl.cc

Index: content/browser/utility_process_host_impl.cc
diff --git a/content/browser/utility_process_host_impl.cc b/content/browser/utility_process_host_impl.cc
index ddab80680dec3fe9662788ae7426c0285ad84905..e4b822865a202d73a2e56cdb14902d7c5e0946cb 100644
--- a/content/browser/utility_process_host_impl.cc
+++ b/content/browser/utility_process_host_impl.cc
@@ -172,10 +172,9 @@
                                                  child_token_));
   mojo_child_connection_.reset(new MojoChildConnection(
       kUtilityMojoApplicationName,
-      base::StringPrintf("%d_0", process_->GetData().id), child_token_,
-      MojoShellContext::GetConnectorForIOThread(),
-      BrowserThread::UnsafeGetMessageLoopForThread(BrowserThread::IO)
-          ->task_runner()));
+      base::StringPrintf("%d_0", process_->GetData().id),
+      child_token_,
+      MojoShellContext::GetConnectorForIOThread()));
 }
 
 UtilityProcessHostImpl::~UtilityProcessHostImpl() {
@@ -240,11 +239,11 @@
 }
 
 shell::InterfaceRegistry* UtilityProcessHostImpl::GetInterfaceRegistry() {
-  return mojo_child_connection_->GetInterfaceRegistry();
+  return mojo_child_connection_->connection()->GetInterfaceRegistry();
 }
 
 shell::InterfaceProvider* UtilityProcessHostImpl::GetRemoteInterfaces() {
-  return mojo_child_connection_->GetRemoteInterfaces();
+  return mojo_child_connection_->connection()->GetRemoteInterfaces();
 }
 
 void UtilityProcessHostImpl::SetName(const base::string16& name) {