Revert of [ios showcase] Integrated TextBadgeView with Showcase.

ios/showcase/text_badge_view/BUILD.gn

Index: ios/showcase/text_badge_view/BUILD.gn
diff --git a/ios/showcase/text_badge_view/BUILD.gn b/ios/showcase/text_badge_view/BUILD.gn
deleted file mode 100644
index ab9a4f032cda1c8c3dd028b3874510fecf8df057..0000000000000000000000000000000000000000
--- a/ios/showcase/text_badge_view/BUILD.gn
+++ /dev/null
@@ -1,26 +0,0 @@
-source_set("text_badge_view") {
-  sources = [
-    "sc_text_badge_view_controller.h",
-    "sc_text_badge_view_controller.mm",
-  ]
-  deps = [
-    "//ios/chrome/browser/ui/reading_list:reading_list_ui",
-  ]
-  libs = [ "UIKit.framework" ]
-  configs += [ "//build/config/compiler:enable_arc" ]
-}
-
-source_set("eg_tests") {
-  testonly = true
-  sources = [
-    "sc_text_badge_view_egtest.mm",
-  ]
-  deps = [
-    "//ios/chrome/browser/ui/reading_list:reading_list_ui",
-    "//ios/chrome/test/earl_grey:test_support",
-    "//ios/showcase/test",
-    "//ios/third_party/earl_grey",
-    "//ui/base",
-  ]
-  configs += [ "//build/config/compiler:enable_arc" ]
-}