Move Mac LaunchOnStartup enable/disable to File thread

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index d58e4dac0658e45f4b881c17104b0ff7e17477b7..4799a7f54f40a8c2e6dca46e24b28e7d1973dea3 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -759,11 +759,6 @@ const char kPreferencesWindowPlacement[] = "preferences.window_placement";
 // renderer's in-memory cache of objects.
 const char kMemoryCacheSize[] = "renderer.memory_cache.size";
 
-// Boolean that records if chrome has set "launch on startup" property for
-// itself earlier and is allowed to reset it later, reducing likelihood of
-// overriding user choices.
-const char kLaunchOnStartupResetAllowed[] = "launch_on_startup_reset_allowed";
-
 // String which specifies where to download files to by default.
 const char kDownloadDefaultDirectory[] = "download.default_directory";