Make the embedder responsible for creating the WebFrame

Source/web/tests/RenderLayerBackingTest.cpp

Index: Source/web/tests/RenderLayerBackingTest.cpp
diff --git a/Source/web/tests/RenderLayerBackingTest.cpp b/Source/web/tests/RenderLayerBackingTest.cpp
index f2e59f83b5f39780819b963569d93d04e630eaa6..3971f40f3ef252eeeb57b94182f6f3eeba076368 100644
--- a/Source/web/tests/RenderLayerBackingTest.cpp
+++ b/Source/web/tests/RenderLayerBackingTest.cpp
@@ -75,6 +75,7 @@ public:
     {
         // We cannot reuse FrameTestHelpers::createWebViewAndLoad here because the compositing
         // settings need to be set before the page is loaded.
+        m_mainFrame = WebFrame::create(&m_mockWebFrameClient);
         m_webViewImpl = toWebViewImpl(WebView::create(&m_mockWebViewClient));
         m_webViewImpl->settings()->setForceCompositingMode(true);
         m_webViewImpl->settings()->setAcceleratedCompositingEnabled(true);
@@ -83,7 +84,7 @@ public:
         m_webViewImpl->settings()->setAcceleratedCompositingForScrollableFramesEnabled(true);
         m_webViewImpl->settings()->setCompositedScrollingForFramesEnabled(true);
         m_webViewImpl->settings()->setFixedPositionCreatesStackingContext(true);
-        m_webViewImpl->initializeMainFrame(&m_mockWebFrameClient);
+        m_webViewImpl->initializeMainFrame(m_mainFrame);
         m_webViewImpl->resize(IntSize(320, 240));
     }
 
@@ -91,6 +92,7 @@ public:
     {
         Platform::current()->unitTestSupport()->unregisterAllMockedURLs();
         m_webViewImpl->close();
+        m_mainFrame->close();
     }
 
     void navigateTo(const std::string& url)
@@ -109,6 +111,7 @@ protected:
     MockWebFrameClient m_mockWebFrameClient;
     MockWebViewClient m_mockWebViewClient;
     WebViewImpl* m_webViewImpl;
+    WebFrame* m_mainFrame;
 };
 
 TEST_F(RenderLayerBackingTest, DISABLED_GraphicsLayerBackgroundColor)