Make EImageRendering an enum class.

third_party/WebKit/Source/core/layout/ImageQualityController.cpp

Index: third_party/WebKit/Source/core/layout/ImageQualityController.cpp
diff --git a/third_party/WebKit/Source/core/layout/ImageQualityController.cpp b/third_party/WebKit/Source/core/layout/ImageQualityController.cpp
index d1a7ffac7c01b2104dbebe4fa7806e7dc9fc7405..7b1d70f408ab1d1a39b984513354d03da52882f2 100644
--- a/third_party/WebKit/Source/core/layout/ImageQualityController.cpp
+++ b/third_party/WebKit/Source/core/layout/ImageQualityController.cpp
@@ -73,7 +73,7 @@ InterpolationQuality ImageQualityController::ChooseInterpolationQuality(
     Image* image,
     const void* layer,
     const LayoutSize& layout_size) {
-  if (object.Style()->ImageRendering() == kImageRenderingPixelated)
+  if (object.Style()->ImageRendering() == EImageRendering::kPixelated)
     return kInterpolationNone;
 
   if (kInterpolationDefault == kInterpolationLow)
@@ -179,7 +179,7 @@ bool ImageQualityController::ShouldPaintAtLowQuality(
   if (!layer)
     return false;
 
-  if (object.Style()->ImageRendering() == kImageRenderingOptimizeContrast)
+  if (object.Style()->ImageRendering() == EImageRendering::kOptimizeContrast)
     return true;
 
   if (LocalFrame* frame = object.GetFrame()) {