Fix crash in WebViewImpl::contentsPreferredMinimumSize

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 3685c4b4286efac4d1d7c3b34aae18da0824e2b0..35acca7449c0db5444e80150272ce6fe129520a3 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -3397,11 +3397,12 @@ IntSize WebViewImpl::contentsSize() const
 
 WebSize WebViewImpl::contentsPreferredMinimumSize()
 {
+    layout();
+
     Document* document = m_page->mainFrame()->isLocalFrame() ? m_page->deprecatedLocalMainFrame()->document() : 0;
     if (!document || !document->layoutView() || !document->documentElement() || !document->documentElement()->layoutBox())
         return WebSize();
 
-    layout();
     int widthScaled = document->layoutView()->minPreferredLogicalWidth().round(); // Already accounts for zoom.
     int heightScaled = document->documentElement()->layoutBox()->scrollHeight().round();
     return IntSize(widthScaled, heightScaled);