Enable side-by-side beta and dev channels.

chrome/installer/mini_installer/chrome_appid.cc

Index: chrome/installer/mini_installer/chrome_appid.cc
diff --git a/chrome/installer/mini_installer/chrome_appid.cc b/chrome/installer/mini_installer/chrome_appid.cc
index 34d3134910cb24bac8ae4e834aa6946fa9abc5ce..19a64d8f49f7b6e5f980ba960c8a4d266d4fb6ff 100644
--- a/chrome/installer/mini_installer/chrome_appid.cc
+++ b/chrome/installer/mini_installer/chrome_appid.cc
@@ -10,11 +10,12 @@ namespace google_update {
 const wchar_t kAppGuid[] = L"{8A69D345-D564-463c-AFF1-A69D9E530F96}";
 const wchar_t kMultiInstallAppGuid[] =
     L"{4DC8B4CA-1BDA-483e-B5FA-D3C12E15B62D}";
+const wchar_t kBetaAppGuid[] = L"{8237E44A-0054-442C-B6B6-EA0509993955}";
+const wchar_t kDevAppGuid[] = L"{401C381F-E0DE-4B85-8BD8-3F3F14FBDA57}";
 const wchar_t kSxSAppGuid[] = L"{4ea16ac7-fd5a-47c3-875b-dbf4a2008c20}";
-#else
+#else   // defined(GOOGLE_CHROME_BUILD)
 const wchar_t kAppGuid[] = L"";
 const wchar_t kMultiInstallAppGuid[] = L"";
-const wchar_t kSxSAppGuid[] = L"";
-#endif
+#endif  // defined(GOOGLE_CHROME_BUILD)
 
 }  // namespace google_update