Run the later parts of startup as UI thread tasks

chrome/browser/chrome_browser_main.h

Index: chrome/browser/chrome_browser_main.h
diff --git a/chrome/browser/chrome_browser_main.h b/chrome/browser/chrome_browser_main.h
index e7cac1d3ca33a61e83f0fa6574d21b8d6fceea40..10c1d8e594edeadae710ee6036e10a92910b73f8 100644
--- a/chrome/browser/chrome_browser_main.h
+++ b/chrome/browser/chrome_browser_main.h
@@ -17,6 +17,7 @@
 #include "chrome/browser/ui/startup/startup_browser_creator.h"
 #include "content/public/browser/browser_main_parts.h"
 #include "content/public/browser/render_view_host.h"
+#include "content/public/common/main_function_params.h"
 
 class ActiveTabTracker;
 class BrowserProcessImpl;
@@ -41,10 +42,6 @@ namespace chrome_browser_metrics {
 class TrackingSynchronizer;
 }
 
-namespace content {
-struct MainFunctionParams;
-}
-
 namespace performance_monitor {
 class StartupTimer;
 }
@@ -134,7 +131,7 @@ class ChromeBrowserMainParts : public content::BrowserMainParts {
 
   // Members initialized on construction ---------------------------------------
 
-  const content::MainFunctionParams& parameters_;
+  const content::MainFunctionParams parameters_;
   const CommandLine& parsed_command_line_;
   int result_code_;