Remove target that cause ambiguity with downstream targets.

ios/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 assert(!is_component_build, "component build is unsupported on iOS")
 
 declare_args() {
   # Control whether cronet is build (this is usually set by the script
   # components/cronet/tools/cr_cronet.py as cronet requires specific
   # gn args to build correctly).
   is_cronet_build = false
 }
 
 # This list all targets that needs to be build as part of "gn_all" on iOS.
 # This list should generally only include executables, but since some code
 # has not yet been upstreamed it will sometimes also include targets that
 # are not used upstream to ensure they are not broken inadvertently.
 group("all") {
   testonly = true
   if (is_cronet_build) {
     deps = [
       "//components/cronet/ios:cronet_package",
       "//ios/crnet:crnet_framework",
       "//ios/crnet/crnet_consumer",
       "//ios/crnet/test:crnet_test",
     ]
   } 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/test:all_tests",
       "//ios/chrome/test/earl_grey:all_tests",
       "//ios/net:all_tests",
       "//ios/showcase/test:all_tests",
       "//ios/testing:all_tests",
       "//ios/web:all_tests",
       "//ios/web/shell/test:all_tests",
 
       # Those dependencies are currently only used from downstream code
       # and will be removed once the dependent code has been upstreamed.
       "//ios/chrome/share_extension:packed_resources",
       "//ios/chrome/today_extension:packed_resources",
     ]
   }
 }