Remove mojo::edk::test::ScopedIPCSupport

extensions/BUILD.gn

 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//extensions/features/features.gni")
 import("//testing/test.gni")
 import("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
 
 assert(enable_extensions)
 
@@ skipping 192 matching lines @@
     ":test_support",
     "//base/test:test_support",
     "//content/public/common",
     "//content/test:test_support",
     "//extensions/browser:unit_tests",
     "//extensions/common",
     "//extensions/common:unit_tests",
     "//extensions/renderer:unit_tests",
     "//extensions/shell:unit_tests",
     "//extensions/utility:unit_tests",
-    "//mojo/edk/test:test_support",
     "//ui/gl:test_support",
   ]
 
   data_deps = [
     "//third_party/mesa:osmesa",
   ]
 }
 
 test("extensions_browsertests") {
   data = [
@@ skipping 126 matching lines @@
     "//testing/gtest",
     "//third_party/hunspell",
     "//third_party/icu",
     "//third_party/libpng",
     "//third_party/zlib",
     "//ui/base:test_support",
     "//ui/resources:ui_test_pak",
     "//ui/web_dialogs:test_support",
   ]
 }