Remove unsafe getFontMetrics methods

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

Index: third_party/WebKit/Source/core/layout/LayoutListBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutListBox.cpp b/third_party/WebKit/Source/core/layout/LayoutListBox.cpp
index 807d2266555478232eb8a169efd1616765c2efe8..7388ff3e1b80bd24322a524675e94ae7d806d8b2 100644
--- a/third_party/WebKit/Source/core/layout/LayoutListBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutListBox.cpp
@@ -66,7 +66,10 @@ unsigned LayoutListBox::size() const {
 }
 
 LayoutUnit LayoutListBox::defaultItemHeight() const {
-  return LayoutUnit(style()->getFontMetrics().height() + defaultPaddingBottom);
+  const SimpleFontData* fontData = style()->font().primaryFont();
+  if (!fontData)
+    return LayoutUnit();
+  return LayoutUnit(fontData->getFontMetrics().height() + defaultPaddingBottom);
 }
 
 LayoutUnit LayoutListBox::itemHeight() const {