Convert ios_web_shell_test to GN.

ios/web/shell/test/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.
+
+import("//ios/build/config.gni")
+import("//ios/third_party/earl_grey/eg_test.gni")
+
+ios_eg_test("ios_web_shell_test") {
+  sources = [
+    "//ios/web/shell/web_exe_main.mm",
+    "web_shell_navigation_egtest.mm",
+  ]
+
+  deps = [
+    "//base",
+    "//ios/third_party/earl_grey:earl_grey+link",
+    "//ios/third_party/ochamcrest:ochamcrest+link",
+    "//ios/web:test_support",
+    "//ios/web/shell",
+    "//ios/web/shell/test:earl_grey_test_support",
+
+    # All shared libraries must have the sanitizer deps to properly link in
+    # asan mode (this target will be empty in other cases).
+    "//build/config/sanitizers:deps",
+  ]
+
+  configs += [ "//build/config/compiler:enable_arc" ]
+
+  assert_no_deps = ios_assert_no_deps
+}
+
+source_set("earl_grey_test_support") {
+  testonly = true
+
+  deps = [
+    "//base",
+    "//base/test:test_support",
+    "//ios/testing/earl_grey:earl_grey_support",
+    "//ios/third_party/earl_grey",
+    "//ios/web",
+    "//ios/web:earl_grey_test_support",
+    "//ios/web:test_support",
+    "//ios/web/shell",
+    "//url",
+  ]
+
+  sources = [
+    "app/navigation_test_util.h",
+    "app/navigation_test_util.mm",
+    "app/web_shell_test_util.h",
+    "app/web_shell_test_util.mm",
+    "app/web_view_interaction_test_util.h",
+    "app/web_view_interaction_test_util.mm",
+    "earl_grey/shell_matchers.h",
+    "earl_grey/shell_matchers.mm",
+  ]
+}