Introduce the abstract class WebViewBase, to decouple WebViewImpl.

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

 // 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 "core/dom/IntersectionObserver.h"
 
 #include "core/dom/IntersectionObserverCallback.h"
 #include "core/dom/IntersectionObserverInit.h"
+#include "core/exported/WebViewBase.h"
 #include "core/frame/FrameView.h"
 #include "platform/testing/UnitTestHelpers.h"
 #include "platform/wtf/CurrentTime.h"
-#include "web/WebViewImpl.h"
 #include "web/tests/sim/SimCompositor.h"
 #include "web/tests/sim/SimDisplayItemList.h"
 #include "web/tests/sim/SimRequest.h"
 #include "web/tests/sim/SimTest.h"
 
 namespace blink {
 
 namespace {
 
 class TestIntersectionObserverCallback : public IntersectionObserverCallback {
@@ skipping 133 matching lines @@
   // those notifications should be discarded.
   GetDocument().View()->LayoutViewportScrollableArea()->SetScrollOffset(
       ScrollOffset(0, 300), kProgrammaticScroll);
   Compositor().BeginFrame();
   observer->disconnect();
   testing::RunPendingTasks();
   EXPECT_EQ(observer_callback->CallCount(), 1);
 }
 
 }  // namespace blink