Implement support for unprefixed keyframes rules resolution.

Source/core/css/resolver/StyleResolver.cpp

Index: Source/core/css/resolver/StyleResolver.cpp
diff --git a/Source/core/css/resolver/StyleResolver.cpp b/Source/core/css/resolver/StyleResolver.cpp
index c5e87af65b09d46f53801ce646e9b8fb0b3dec66..fac6ae3ae8ee1967c5b89a7e904931c584a496fe 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -281,13 +281,6 @@ void StyleResolver::popParentShadowRoot(const ShadowRoot* shadowRoot)
     m_styleTree.popStyleCache(shadowRoot);
 }
 
-// This is a simplified style setting function for keyframe styles
-void StyleResolver::addKeyframeStyle(PassRefPtr<StyleRuleKeyframes> rule)
-{
-    AtomicString s(rule->name());
-    m_keyframesRuleMap.set(s.impl(), rule);
-}
-
 StyleResolver::~StyleResolver()
 {
     m_fontSelector->clearDocument();