Remove unnecessary dependencies on mojo/edk/system

ios/web/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.
 
 import("//ios/web/js_compile.gni")
 import("//testing/test.gni")
 import("//tools/grit/grit_rule.gni")
 
 source_set("web") {
   deps = [
     ":core",
     ":js_resources",
     ":resources",
     ":user_agent",
     "//base",
     "//components/url_formatter",
     "//ios/net",
     "//ios/third_party/blink:html_tokenizer",
-    "//mojo/edk/system",
     "//mojo/public/cpp/system",
     "//mojo/public/js",
     "//net",
     "//services/shell/public/cpp",
     "//ui/base",
     "//ui/gfx",
     "//ui/gfx/geometry:geometry",
     "//ui/resources",
     "//url",
   ]
@@ skipping 378 matching lines @@
     ":core",
     ":ios_web_unittests_bundle_data",
     ":run_all_unittests",
     ":test_support",
     ":web",
     "//base",
     "//base/test:test_support",
     "//ios/net",
     "//ios/testing:ocmock_support",
     "//ios/web/test:mojo_bindings",
-    "//mojo/edk/system",
     "//net:test_support",
     "//services/shell/public/cpp",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/ocmock",
     "//ui/base:test_support",
   ]
 
   sources = [
     "active_state_manager_impl_unittest.mm",
@@ skipping 119 matching lines @@
 }
 
 grit("resources") {
   source = "ios_web_resources.grd"
   use_qualified_include = true
   outputs = [
     "grit/ios_web_resources.h",
     "ios_web_resources.pak",
   ]
 }