Migrate GpuProcess to use MojoChild/ShellConnection for the Shell handshake

content/browser/gpu/gpu_process_host.h

Index: content/browser/gpu/gpu_process_host.h
diff --git a/content/browser/gpu/gpu_process_host.h b/content/browser/gpu/gpu_process_host.h
index 058ee9f59b4b17fab46de925f095a5bdf773703b..ee9ce1ed7ca75e6164ebd8c313aea11291b6487a 100644
--- a/content/browser/gpu/gpu_process_host.h
+++ b/content/browser/gpu/gpu_process_host.h
@@ -49,7 +49,7 @@ namespace content {
 class BrowserChildProcessHostImpl;
 class GpuMainThread;
 class InProcessChildThreadParams;
-class MojoApplicationHost;
+class MojoChildConnection;
 class RenderWidgetHostViewFrameSubscriber;
 class ShaderDiskCache;
 
@@ -293,7 +293,7 @@ class GpuProcessHost : public BrowserChildProcessHostDelegate,
   // Browser-side Mojo endpoint which sets up a Mojo channel with the child
   // process and contains the browser's InterfaceRegistry.
   const std::string child_token_;
-  std::unique_ptr<MojoApplicationHost> mojo_application_host_;
+  std::unique_ptr<MojoChildConnection> mojo_child_connection_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuProcessHost);
 };