Extract WebViewClient implementation out of WebTestProxyBase.

components/test_runner/web_frame_test_client.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 "components/test_runner/web_frame_test_client.h"
 
+#include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "components/test_runner/accessibility_controller.h"
 #include "components/test_runner/event_sender.h"
 #include "components/test_runner/mock_color_chooser.h"
 #include "components/test_runner/mock_screen_orientation_client.h"
 #include "components/test_runner/mock_web_user_media_client.h"
 #include "components/test_runner/test_common.h"
@@ skipping 178 matching lines @@
 }  // namespace
 
 WebFrameTestClient::WebFrameTestClient(
     TestRunner* test_runner,
     WebTestDelegate* delegate,
     AccessibilityController* accessibility_controller,
     EventSender* event_sender)
     : test_runner_(test_runner),
       delegate_(delegate),
       accessibility_controller_(accessibility_controller),
-      event_sender_(event_sender) {}
+      event_sender_(event_sender) {
+  DCHECK(test_runner);
+  DCHECK(delegate_);
+  DCHECK(accessibility_controller_);
+  DCHECK(event_sender_);
+}
 
 WebFrameTestClient::~WebFrameTestClient() {}
 
 blink::WebColorChooser* WebFrameTestClient::createColorChooser(
     blink::WebColorChooserClient* client,
     const blink::WebColor& color,
     const blink::WebVector<blink::WebColorSuggestion>& suggestions) {
   // This instance is deleted by WebCore::ColorInputType
   return new MockColorChooser(client, delegate_, test_runner_);
 }
@@ skipping 540 matching lines @@
   std::string device_id = sink_id.utf8();
   if (device_id == "valid" || device_id.empty())
     callback->onSuccess();
   else if (device_id == "unauthorized")
     callback->onError(blink::WebSetSinkIdError::NotAuthorized);
   else
     callback->onError(blink::WebSetSinkIdError::NotFound);
 }
 
 }  // namespace test_runner