Make the constructor of a LayoutRect from an IntRect explicit.

Source/web/tests/WebViewTest.cpp

Index: Source/web/tests/WebViewTest.cpp
diff --git a/Source/web/tests/WebViewTest.cpp b/Source/web/tests/WebViewTest.cpp
index 4227d001c3fc8ec16a9ec4d8ec150281c9d2c752..5819e60bb94178009a99062ed75be376ff8b67b6 100644
--- a/Source/web/tests/WebViewTest.cpp
+++ b/Source/web/tests/WebViewTest.cpp
@@ -352,7 +352,7 @@ TEST_F(WebViewTest, SetBaseBackgroundColorAndBlendWithExistingContent)
     // Paint the root of the main frame in the way that CompositedLayerMapping would.
     FrameView* view = m_webViewHelper.webViewImpl()->mainFrameImpl()->frameView();
     Layer* rootLayer = view->layoutView()->layer();
-    IntRect paintRect(0, 0, kWidth, kHeight);
+    LayoutRect paintRect(0, 0, kWidth, kHeight);
     LayerPaintingInfo paintingInfo(rootLayer, paintRect, PaintBehaviorNormal, LayoutSize());
     LayerPainter(*rootLayer).paintLayerContents(&context, paintingInfo, PaintLayerPaintingCompositingAllPhases);