Remove support for anonymous deprecated flexboxes.

Source/core/rendering/RenderBlock.cpp

Index: Source/core/rendering/RenderBlock.cpp
diff --git a/Source/core/rendering/RenderBlock.cpp b/Source/core/rendering/RenderBlock.cpp
index 9fb28a5b6d43768a0d61ef36a11edd9d4d12b810..1e6adbe7cc4bef7b62b26d957703b385884c9e42 100644
--- a/Source/core/rendering/RenderBlock.cpp
+++ b/Source/core/rendering/RenderBlock.cpp
@@ -4690,11 +4690,7 @@ RenderBlock* RenderBlock::createAnonymousWithParentRendererAndDisplay(const Rend
     // FIXME: Do we need to convert all our inline displays to block-type in the anonymous logic ?
     EDisplay newDisplay;
     RenderBlock* newBox = 0;
-    if (display == BOX || display == INLINE_BOX) {
-        // FIXME: Remove this case once we have eliminated all internal users of old flexbox
-        newBox = RenderDeprecatedFlexibleBox::createAnonymous(&parent->document());
-        newDisplay = BOX;
-    } else if (display == FLEX || display == INLINE_FLEX) {
+    if (display == FLEX || display == INLINE_FLEX) {
         newBox = RenderFlexibleBox::createAnonymous(&parent->document());
         newDisplay = FLEX;
     } else {