Fewer reused duplicate symbol names in animation.

third_party/WebKit/Source/core/animation/CSSImageSliceInterpolationType.cpp

Index: third_party/WebKit/Source/core/animation/CSSImageSliceInterpolationType.cpp
diff --git a/third_party/WebKit/Source/core/animation/CSSImageSliceInterpolationType.cpp b/third_party/WebKit/Source/core/animation/CSSImageSliceInterpolationType.cpp
index a7f4c4afc12207e57907d633e7f741aeb0765df5..6968b2431e31c44ff48db5a657048a986659f7ae 100644
--- a/third_party/WebKit/Source/core/animation/CSSImageSliceInterpolationType.cpp
+++ b/third_party/WebKit/Source/core/animation/CSSImageSliceInterpolationType.cpp
@@ -4,25 +4,18 @@
 
 #include "core/animation/CSSImageSliceInterpolationType.h"
 
+#include <memory>
 #include "core/animation/CSSLengthInterpolationType.h"
 #include "core/animation/ImageSlicePropertyFunctions.h"
+#include "core/animation/SideIndex.h"
 #include "core/css/CSSBorderImageSliceValue.h"
 #include "core/css/resolver/StyleResolverState.h"
 #include "wtf/PtrUtil.h"
-#include <memory>
 
 namespace blink {
 
 namespace {
 
-enum SideIndex : unsigned {
-  SideTop,
-  SideRight,
-  SideBottom,
-  SideLeft,
-  SideIndexCount,
-};
-
 struct SliceTypes {
   explicit SliceTypes(const ImageSlice& slice) {
     isNumber[SideTop] = slice.slices.top().isFixed();