Remove target that cause ambiguity with downstream targets.

BUG=666375

Review-Url: https://codereview.chromium.org/2582033002
Cr-Commit-Position: refs/heads/master@{#439120}

ios/BUILD.gn

@@ -27,9 +27,6 @@ group("all") {
   } else {
     deps = [
       # List all the targets that need to be build on iOS by default.
-      "//ios/chrome/app:chrome",
-      "//ios/chrome/app:chrome_clean_skeleton",
-      "//ios/showcase",
       "//ios/web/shell:ios_web_shell",
 
       # List all the test targets that need to be build on iOS by default.

ios/chrome/app/BUILD.gn

@@ -7,18 +7,6 @@ import("//build/mac/tweak_info_plist.gni")
 import("//ios/build/chrome_build.gni")
 import("//ios/public/provider/chrome/browser/build_config.gni")
 
-# This empty target is there to help with upstreaming by removing a manual
-# step from the process (updating the //ios:all target). It will be changed
-# to a real target as part of upstreaming.
-group("chrome") {
-}
-
-# This empty target is there to help with upstreaming by removing a manual
-# step from the process (updating the //ios:all target). It will be changed
-# to a real target as part of upstreaming.
-group("chrome_clean_skeleton") {
-}
-
 source_set("app") {
   sources = [
     "deferred_initialization_runner.h",