Split up ios/web:test_support.

ios/web/public/test/fakes/BUILD.gn

Index: ios/web/public/test/fakes/BUILD.gn
diff --git a/ios/web/public/test/fakes/BUILD.gn b/ios/web/public/test/fakes/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..6746ba4bbca2362e5007fdaa1628fbd211deb4cb
--- /dev/null
+++ b/ios/web/public/test/fakes/BUILD.gn
@@ -0,0 +1,46 @@
+# Copyright 2017 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("fakes") {
+  testonly = true
+
+  deps = [
+    "//base",
+    "//ios/web:web",
+    "//ios/web/test:test_constants",
+    "//mojo/common:common_custom_types",
+    "//net:test_support",
+    "//testing/gtest",
+    "//ui/base",
+  ]
+
+  sources = [
+    "crw_test_js_injection_receiver.h",
+    "crw_test_js_injection_receiver.mm",
+    "crw_test_web_state_observer.h",
+    "crw_test_web_state_observer.mm",
+    "test_browser_state.cc",
+    "test_browser_state.h",
+    "test_java_script_dialog_presenter.h",
+    "test_java_script_dialog_presenter.mm",
+    "test_native_content.h",
+    "test_native_content.mm",
+    "test_native_content_provider.h",
+    "test_native_content_provider.mm",
+    "test_navigation_manager.h",
+    "test_navigation_manager.mm",
+    "test_web_client.h",
+    "test_web_client.mm",
+    "test_web_state.h",
+    "test_web_state.mm",
+    "test_web_state_delegate.h",
+    "test_web_state_delegate.mm",
+    "test_web_state_observer.h",
+    "test_web_state_observer.mm",
+    "test_web_state_observer_util.h",
+    "test_web_state_observer_util.mm",
+    "test_web_view_content_view.h",
+    "test_web_view_content_view.mm",
+  ]
+}