Re-fix http://crbug.com/87176, and add a test.

content/test/test_web_contents_view.cc

 // Copyright (c) 2012 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 "content/test/test_web_contents_view.h"
 
+#include "content/browser/renderer_host/test_render_view_host.h"
+
 namespace content {
 
 TestWebContentsView::TestWebContentsView() {
 }
 
 TestWebContentsView::~TestWebContentsView() {
 }
 
 void TestWebContentsView::ShowContextMenu(const ContextMenuParams& params,
                                           ContextMenuSourceType type) {
@@ skipping 71 matching lines @@
 void TestWebContentsView::SetAllowOverlappingViews(bool overlapping) {
 }
 #endif
 
 void TestWebContentsView::CreateView(const gfx::Size& initial_size,
                                      gfx::NativeView context) {
 }
 
 RenderWidgetHostView* TestWebContentsView::CreateViewForWidget(
     RenderWidgetHost* render_widget_host) {
-  return NULL;
+  return new TestRenderWidgetHostView(render_widget_host);
 }
 
 RenderWidgetHostView* TestWebContentsView::CreateViewForPopupWidget(
     RenderWidgetHost* render_widget_host) {
-  return NULL;
+  return new TestRenderWidgetHostView(render_widget_host);
 }
 
 void TestWebContentsView::SetPageTitle(const string16& title) {
 }
 
 void TestWebContentsView::RenderViewCreated(RenderViewHost* host) {
 }
 
 void TestWebContentsView::RenderViewSwappedIn(RenderViewHost* host) {
 }
 
 void TestWebContentsView::SetOverscrollControllerEnabled(bool enabled) {
 }
 
 #if defined(OS_MACOSX)
 bool TestWebContentsView::IsEventTracking() const {
   return false;
 }
 
 void TestWebContentsView::CloseTabAfterEventTracking() {
 }
 #endif
 
 }  // namespace content