Simplify tests by using Web*Impl types directly.

third_party/WebKit/Source/web/tests/DocumentLoaderTest.cpp

 // Copyright 2015 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 "platform/testing/URLTestHelpers.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebURLLoaderClient.h"
 #include "public/platform/WebURLLoaderMockFactory.h"
 #include "public/web/WebCache.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 16 matching lines @@
     }
 
     void TearDown() override
     {
         Platform::current()->getURLLoaderMockFactory()->unregisterAllURLs();
         WebCache::clear();
     }
 
     WebLocalFrameImpl* mainFrame()
     {
-        return m_webViewHelper.webViewImpl()->mainFrameImpl();
+        return m_webViewHelper.webView()->mainFrameImpl();
     }
 
     FrameTestHelpers::WebViewHelper m_webViewHelper;
 };
 
 TEST_F(DocumentLoaderTest, SingleChunk)
 {
     class TestDelegate : public WebURLLoaderTestDelegate {
     public:
         void didReceiveData(WebURLLoaderClient* originalClient, WebURLLoader* loader, const char* data, int dataLength, int encodedDataLength) override
@@ skipping 113 matching lines @@
     Platform::current()->getURLLoaderMockFactory()->setLoaderDelegate(nullptr);
 
     EXPECT_TRUE(delegate.servedReentrantly());
 
     // delegate is a WebFrameClient and stack-allocated, so manually reset() the
     // WebViewHelper here.
     m_webViewHelper.reset();
 }
 
 } // namespace blink