Resolve em units against the specified font size in SVG

Source/core/svg/SVGLengthContext.cpp

Index: Source/core/svg/SVGLengthContext.cpp
diff --git a/Source/core/svg/SVGLengthContext.cpp b/Source/core/svg/SVGLengthContext.cpp
index 42416b12f084b4f3339ec114eb351e9cd4943321..b7fc72c632e87a1fa4580ff39690fc14d9a6804a 100644
--- a/Source/core/svg/SVGLengthContext.cpp
+++ b/Source/core/svg/SVGLengthContext.cpp
@@ -228,7 +228,7 @@ float SVGLengthContext::convertValueFromUserUnitsToEMS(float value, ExceptionCod
         return 0;
     }
 
-    float fontSize = style->fontSize();
+    float fontSize = style->specifiedFontSize();
     if (!fontSize) {
         ec = NotSupportedError;
         return 0;
@@ -245,7 +245,7 @@ float SVGLengthContext::convertValueFromEMSToUserUnits(float value, ExceptionCod
         return 0;
     }
 
-    return value * style->fontSize();
+    return value * style->specifiedFontSize();
 }
 
 float SVGLengthContext::convertValueFromUserUnitsToEXS(float value, ExceptionCode& ec) const