Determine used fonts based on the correct font code path

third_party/WebKit/Source/platform/fonts/Font.h

Index: third_party/WebKit/Source/platform/fonts/Font.h
diff --git a/third_party/WebKit/Source/platform/fonts/Font.h b/third_party/WebKit/Source/platform/fonts/Font.h
index 3054f03887baebba5a6dce7cbe526df9fc129258..7660ae95162b9fc1951297a2d7a1f488c7630564 100644
--- a/third_party/WebKit/Source/platform/fonts/Font.h
+++ b/third_party/WebKit/Source/platform/fonts/Font.h
@@ -162,6 +162,9 @@ private:
     mutable RefPtr<FontFallbackList> m_fontFallbackList;
     mutable unsigned m_canShapeWordByWord : 1;
     mutable unsigned m_shapeWordByWordComputed : 1;
+
+    // For accessing buildGlyphBuffer and retrieving fonts used in rendering a node.
+    friend class InspectorCSSAgent;
 };
 
 inline Font::~Font()