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

content/public/browser/render_process_host.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 245 matching lines @@
   virtual void NotifyTimezoneChange(const std::string& zone_id) = 0;
 
   // Returns the shell::InterfaceRegistry the browser process uses to expose
   // interfaces to the renderer.
   virtual shell::InterfaceRegistry* GetInterfaceRegistry() = 0;
 
   // Returns the shell::InterfaceProvider the browser process can use to bind
   // interfaces exposed to it from the renderer.
   virtual shell::InterfaceProvider* GetRemoteInterfaces() = 0;
 
+  // Returns the shell connection for this process.
+  virtual shell::Connection* GetChildConnection() = 0;
+
   // Extracts any persistent-memory-allocator used for renderer metrics.
   // Ownership is passed to the caller. To support sharing of histogram data
   // between the Renderer and the Browser, the allocator is created when the
   // process is created and later retrieved by the SubprocessMetricsProvider
   // for management.
   virtual std::unique_ptr<base::SharedPersistentMemoryAllocator>
   TakeMetricsAllocator() = 0;
 
   // PlzNavigate
   // Returns the time the first call to Init completed successfully (after a new
@@ skipping 85 matching lines @@
   static void SetMaxRendererProcessCount(size_t count);
 
   // Returns the current maximum number of renderer process hosts kept by the
   // content module.
   static size_t GetMaxRendererProcessCount();
 };
 
 }  // namespace content.
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_