Use toCSSFooValue() instead of using static_cast<const CSSFooValue*>

Source/core/css/CSSImageGeneratorValue.cpp

Index: Source/core/css/CSSImageGeneratorValue.cpp
diff --git a/Source/core/css/CSSImageGeneratorValue.cpp b/Source/core/css/CSSImageGeneratorValue.cpp
index 19a87cf37d4157a487b7a9be8eeb8a6fdb37cd7b..0fb08b15424d2678357319c107158cc99cf51ce2 100644
--- a/Source/core/css/CSSImageGeneratorValue.cpp
+++ b/Source/core/css/CSSImageGeneratorValue.cpp
@@ -127,13 +127,13 @@ bool CSSImageGeneratorValue::isFixedSize() const
 {
     switch (classType()) {
     case CanvasClass:
-        return static_cast<const CSSCanvasValue*>(this)->isFixedSize();
+        return toCSSCanvasValue(this)->isFixedSize();
     case CrossfadeClass:
-        return static_cast<const CSSCrossfadeValue*>(this)->isFixedSize();
+        return toCSSCrossfadeValue(this)->isFixedSize();
     case LinearGradientClass:
-        return static_cast<const CSSLinearGradientValue*>(this)->isFixedSize();
+        return toCSSLinearGradientValue(this)->isFixedSize();
     case RadialGradientClass:
-        return static_cast<const CSSRadialGradientValue*>(this)->isFixedSize();
+        return toCSSRadialGradientValue(this)->isFixedSize();
     default:
         ASSERT_NOT_REACHED();
     }
@@ -161,13 +161,13 @@ bool CSSImageGeneratorValue::isPending() const
 {
     switch (classType()) {
     case CrossfadeClass:
-        return static_cast<const CSSCrossfadeValue*>(this)->isPending();
+        return toCSSCrossfadeValue(this)->isPending();
     case CanvasClass:
-        return static_cast<const CSSCanvasValue*>(this)->isPending();
+        return toCSSCanvasValue(this)->isPending();
     case LinearGradientClass:
-        return static_cast<const CSSLinearGradientValue*>(this)->isPending();
+        return toCSSLinearGradientValue(this)->isPending();
     case RadialGradientClass:
-        return static_cast<const CSSRadialGradientValue*>(this)->isPending();
+        return toCSSRadialGradientValue(this)->isPending();
     default:
         ASSERT_NOT_REACHED();
     }
@@ -178,13 +178,13 @@ bool CSSImageGeneratorValue::knownToBeOpaque(const RenderObject* renderer) const
 {
     switch (classType()) {
     case CrossfadeClass:
-        return static_cast<const CSSCrossfadeValue*>(this)->knownToBeOpaque(renderer);
+        return toCSSCrossfadeValue(this)->knownToBeOpaque(renderer);
     case CanvasClass:
         return false;
     case LinearGradientClass:
-        return static_cast<const CSSLinearGradientValue*>(this)->knownToBeOpaque(renderer);
+        return toCSSLinearGradientValue(this)->knownToBeOpaque(renderer);
     case RadialGradientClass:
-        return static_cast<const CSSRadialGradientValue*>(this)->knownToBeOpaque(renderer);
+        return toCSSRadialGradientValue(this)->knownToBeOpaque(renderer);
     default:
         ASSERT_NOT_REACHED();
     }