Convert UtilityProcessHost to bootstrap Mojo Channel using the Shell connection

content/browser/browser_main_loop.h

Index: content/browser/browser_main_loop.h
diff --git a/content/browser/browser_main_loop.h b/content/browser/browser_main_loop.h
index 62ba7ac9e030c8d1a27665a72a270d5da7186438..7984cc9158193c952d44408090e5f92329387ebf 100644
--- a/content/browser/browser_main_loop.h
+++ b/content/browser/browser_main_loop.h
@@ -72,8 +72,8 @@ class BrowserOnlineStateObserver;
 class BrowserThreadImpl;
 class LoaderDelegateImpl;
 class MediaStreamManager;
-class MojoShellContext;
 class ResourceDispatcherHostImpl;
+class ShellContext;
 class SpeechRecognitionManagerImpl;
 class StartupTaskRunner;
 class TimeZoneMonitor;
@@ -260,7 +260,7 @@ class CONTENT_EXPORT BrowserMainLoop {
 
   // Members initialized in |BrowserThreadsStarted()| --------------------------
   std::unique_ptr<base::Thread> indexed_db_thread_;
-  std::unique_ptr<MojoShellContext> mojo_shell_context_;
+  std::unique_ptr<ShellContext> shell_context_;
   std::unique_ptr<mojo::edk::ScopedIPCSupport> mojo_ipc_support_;
 
   // |user_input_monitor_| has to outlive |audio_manager_|, so declared first.