[ios Mojo] Integration test for Mojo WebUI.

ios/web/BUILD.gn

Index: ios/web/BUILD.gn
diff --git a/ios/web/BUILD.gn b/ios/web/BUILD.gn
index e77799d78ff3f3efde6f963328f64581b85f76e4..12e714c501abb13f6131e9cbe01f653fac309b96 100644
--- a/ios/web/BUILD.gn
+++ b/ios/web/BUILD.gn
@@ -473,8 +473,13 @@ test("ios_web_inttests") {
     ":test_support",
     ":web",
     "//base/test:test_support",
+    "//ios/public/provider/web",
+    "//ios/web/test:mojo_bindings",
+    "//ios/web/test:packed_resources",
+    "//ios/web/test:resources",
     "//mojo/edk/system",
     "//net:test_support",
+    "//services/shell/public/cpp",
     "//testing/gtest",
     "//ui/base:test_support",
   ]
@@ -482,6 +487,7 @@ test("ios_web_inttests") {
     "browser_state_web_view_partition_inttest.mm",
     "public/test/http_server_inttest.mm",
     "test/run_all_unittests.cc",
+    "webui/web_ui_mojo_inttest.mm",
   ]
 }
 
@@ -535,8 +541,4 @@ grit("resources") {
     "grit/ios_web_resources.h",
     "ios_web_resources.pak",
   ]
-  grit_flags = [
-    "-E",
-    "root_out_dir=" + rebase_path(root_out_dir, root_build_dir),
-  ]
 }