Mojo EDK: Clean shutdown for ScopedIPCSupport in tests

chrome/renderer/chrome_render_frame_observer_browsertest.cc

 // 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.
 
 #include "chrome/renderer/chrome_render_frame_observer.h"
 
 #include <tuple>
 
+#include "base/run_loop.h"
 #include "base/test/histogram_tester.h"
 #include "chrome/test/base/chrome_render_view_test.h"
 #include "components/translate/content/common/translate.mojom.h"
 #include "components/translate/content/renderer/translate_helper.h"
 #include "components/translate/core/common/translate_constants.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_view.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/service_manager/public/cpp/interface_provider.h"
 #include "third_party/WebKit/public/web/WebView.h"
@@ skipping 60 matching lines @@
   view_->GetWebView()->updateAllLifecyclePhases();
 
   base::RunLoop().RunUntilIdle();
   ASSERT_TRUE(fake_translate_driver_.called_new_page_);
   EXPECT_TRUE(fake_translate_driver_.page_needs_translation_)
       << "Page should be translatable.";
   // Should have 2 samples: one for preliminary capture, one for final capture.
   // If there are more, then subframes are being captured more than once.
   histogram_tester.ExpectTotalCount(kTranslateCaptureText, 2);
 }