[Merge M48] Remove support for chrome_shortcut_icon_index master_pref.

chrome/installer/util/master_preferences_constants.cc

Index: chrome/installer/util/master_preferences_constants.cc
diff --git a/chrome/installer/util/master_preferences_constants.cc b/chrome/installer/util/master_preferences_constants.cc
index 0e7bcc85fe1bcc0ded8a797c992ff212fe9dda3c..0c43b6c9277fcf3cbf8704564cb0eb54f18a794b 100644
--- a/chrome/installer/util/master_preferences_constants.cc
+++ b/chrome/installer/util/master_preferences_constants.cc
@@ -8,7 +8,6 @@ namespace installer {
 namespace master_preferences {
   const char kAltShortcutText[] = "alternate_shortcut_text";
   const char kChrome[] = "chrome";
-  const char kChromeShortcutIconIndex[] = "chrome_shortcut_icon_index";
   const char kCreateAllShortcuts[] = "create_all_shortcuts";
   const char kDisableLogging[] = "disable_logging";
   const char kDistroDict[] = "distribution";