Remove obsolete targets and dependencies.

ios/chrome/app/BUILD.gn

 # Copyright 2015 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.
 
 source_set("app") {
   sources = [
     "deferred_initialization_runner.h",
     "deferred_initialization_runner.mm",
     "safe_mode_crashing_modules_config.h",
     "safe_mode_crashing_modules_config.mm",
     "safe_mode_util.cc",
     "safe_mode_util.h",
   ]
 
-  # TODO(crbug.com/658242): Remove this dependency once all of downstream code
-  # dependencies have been fixed to not require it.
-  public_deps = [
-    "//ios/chrome/app/application_delegate",
-  ]
-
   deps = [
     "//base",
   ]
 
   libs = [ "Foundation.framework" ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "deferred_initialization_runner_unittest.mm",
     "safe_mode_util_unittest.cc",
   ]
   deps = [
     ":app",
     "//base",
     "//base/test:test_support",
     "//testing/gtest",
   ]
 }