Revert of Enable side-by-side beta and dev channels.

chrome/BUILD.gn

Index: chrome/BUILD.gn
diff --git a/chrome/BUILD.gn b/chrome/BUILD.gn
index 090e98d8a0be21cb71e730d77a0806cb0b513a85..5b70b87ce8db373f2593da95f34c575fd45c6801 100644
--- a/chrome/BUILD.gn
+++ b/chrome/BUILD.gn
@@ -1428,12 +1428,8 @@
 
   if (is_chrome_branded) {
     sources += [
-      "//chrome/app/theme/$branding_path_component/win/tiles/LogoBeta.png",
       "//chrome/app/theme/$branding_path_component/win/tiles/LogoCanary.png",
-      "//chrome/app/theme/$branding_path_component/win/tiles/LogoDev.png",
-      "//chrome/app/theme/$branding_path_component/win/tiles/SmallLogoBeta.png",
       "//chrome/app/theme/$branding_path_component/win/tiles/SmallLogoCanary.png",
-      "//chrome/app/theme/$branding_path_component/win/tiles/SmallLogoDev.png",
     ]
   }