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

chrome/installer/launcher_support/chrome_launcher_support.h

Index: chrome/installer/launcher_support/chrome_launcher_support.h
diff --git a/chrome/installer/launcher_support/chrome_launcher_support.h b/chrome/installer/launcher_support/chrome_launcher_support.h
index 7c5bc681540c2c1984863eef0c52a036cd65758f..89162950bf1b2098ecf3eb73ad4a69714a52f5e9 100644
--- a/chrome/installer/launcher_support/chrome_launcher_support.h
+++ b/chrome/installer/launcher_support/chrome_launcher_support.h
@@ -7,6 +7,7 @@
 
 namespace base {
 class FilePath;
+class Version;
 }
 
 namespace chrome_launcher_support {
@@ -68,6 +69,9 @@ bool IsAppLauncherPresent();
 // if installed. If it is not an official build, it will always return true.
 bool IsChromeBrowserPresent();
 
+// Returns true if a given |version| of App Launcher uses legacy app_host.exe.
+bool HasLegacyAppHostExe(const base::Version& version);
+
 }  // namespace chrome_launcher_support
 
 #endif  // CHROME_INSTALLER_LAUNCHER_SUPPORT_CHROME_LAUNCHER_SUPPORT_H_