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

content/public/test/mock_render_process_host.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/test/mock_render_process_host.h"
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
@@ skipping 251 matching lines @@
 }
 
 shell::InterfaceRegistry* MockRenderProcessHost::GetInterfaceRegistry() {
   return interface_registry_.get();
 }
 
 shell::InterfaceProvider* MockRenderProcessHost::GetRemoteInterfaces() {
   return remote_interfaces_.get();
 }
 
+shell::Connection* MockRenderProcessHost::GetChildConnection() {
+  return nullptr;
+}
+
 std::unique_ptr<base::SharedPersistentMemoryAllocator>
 MockRenderProcessHost::TakeMetricsAllocator() {
   return nullptr;
 }
 
 const base::TimeTicks& MockRenderProcessHost::GetInitTimeForNavigationMetrics()
     const {
   static base::TimeTicks dummy_time = base::TimeTicks::Now();
   return dummy_time;
 }
@@ skipping 93 matching lines @@
   for (ScopedVector<MockRenderProcessHost>::iterator it = processes_.begin();
        it != processes_.end(); ++it) {
     if (*it == host) {
       processes_.weak_erase(it);
       break;
     }
   }
 }
 
 }  // namespace content