Do not correct for zoom for number line-height

Source/core/css/LayoutStyleCSSValueMapping.cpp

Index: Source/core/css/LayoutStyleCSSValueMapping.cpp
diff --git a/Source/core/css/LayoutStyleCSSValueMapping.cpp b/Source/core/css/LayoutStyleCSSValueMapping.cpp
index 4c8dbb4a7f6c217611e9f6c83b2b803f3fb056d7..c47287c7fdc23ba411d88908a809859cb0015e4c 100644
--- a/Source/core/css/LayoutStyleCSSValueMapping.cpp
+++ b/Source/core/css/LayoutStyleCSSValueMapping.cpp
@@ -476,7 +476,11 @@ static PassRefPtrWillBeRawPtr<CSSPrimitiveValue> valueForLineHeight(const Layout
     if (length.isNegative())
         return cssValuePool().createIdentifierValue(CSSValueNormal);
 
-    return zoomAdjustedPixelValue(floatValueForLength(length, style.fontDescription().specifiedSize()), style);
+    float floatValue = floatValueForLength(length, style.fontDescription().specifiedSize());
+    if (length.isPercent())
+        return cssValuePool().createValue(floatValue, CSSPrimitiveValue::CSS_PX);
+
+    return zoomAdjustedPixelValue(floatValue, style);
 }
 
 static CSSValueID identifierForFamily(const AtomicString& family)