Clear baseLayoutStyle when the font selector version has increased.

Source/platform/fonts/Font.cpp

Index: Source/platform/fonts/Font.cpp
diff --git a/Source/platform/fonts/Font.cpp b/Source/platform/fonts/Font.cpp
index 606fc1ce7b184dd85a3767832c99f3ab3c069fae..5962cdc9376fd9a45d78eaf44fb09479c91db4f3 100644
--- a/Source/platform/fonts/Font.cpp
+++ b/Source/platform/fonts/Font.cpp
@@ -942,4 +942,14 @@ int Font::offsetForPositionForSimpleText(const TextRun& run, float x, bool inclu
     return offset;
 }
 
+bool Font::loadingCustomFonts() const
+{
+    return m_fontFallbackList && m_fontFallbackList->loadingCustomFonts();
+}
+
+bool Font::isFallbackValid() const
+{
+    return !m_fontFallbackList || m_fontFallbackList->isValid();
+}
+
 } // namespace blink