TextAutosizer should handle frames without a FrameView.

third_party/WebKit/Source/core/layout/TextAutosizer.cpp

Index: third_party/WebKit/Source/core/layout/TextAutosizer.cpp
diff --git a/third_party/WebKit/Source/core/layout/TextAutosizer.cpp b/third_party/WebKit/Source/core/layout/TextAutosizer.cpp
index b2c19d5f397c7171755c0758e27ce39b3796fcc9..4d2bed9ce3ec90a091fb87dbea191f68847b853b 100644
--- a/third_party/WebKit/Source/core/layout/TextAutosizer.cpp
+++ b/third_party/WebKit/Source/core/layout/TextAutosizer.cpp
@@ -532,6 +532,9 @@ void TextAutosizer::updatePageInfo()
             return;
 
         LocalFrame* mainFrame = m_document->page()->deprecatedLocalMainFrame();
+        if (!mainFrame->view())
+            return;
+
         IntSize frameSize = m_document->settings()->textAutosizingWindowSizeOverride();
         if (frameSize.isEmpty())
             frameSize = windowSize();