Implementing unified Chrome / App Launcher flow, and migrating old stand-alone App Launcher.

chrome/installer/launcher_support/chrome_launcher_support.cc

Index: chrome/installer/launcher_support/chrome_launcher_support.cc
diff --git a/chrome/installer/launcher_support/chrome_launcher_support.cc b/chrome/installer/launcher_support/chrome_launcher_support.cc
index 61a6bb2a46aadaef214444ddfca9805bc207108d..0145d09b910a362fd31a4007e143e7c6267bc19c 100644
--- a/chrome/installer/launcher_support/chrome_launcher_support.cc
+++ b/chrome/installer/launcher_support/chrome_launcher_support.cc
@@ -12,6 +12,7 @@
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/string16.h"
+#include "base/version.h"
 #include "base/win/registry.h"
 
 #ifndef OFFICIAL_BUILD
@@ -215,4 +216,8 @@ bool IsChromeBrowserPresent() {
       IsProductInstalled(SYSTEM_LEVEL_INSTALLATION, kBrowserAppGuid);
 }
 
+bool HasLegacyAppHostExe(const base::Version& version) {
+  return version.IsOlderThan("28.0.1488.0");
+}
+
 }  // namespace chrome_launcher_support