Remove KeyframeEffectModel.h include from StyleResolver.h

Replace the include with forward declarations.

Prior to this patch, KeyframeEffectModel.h had roughly 700 targets
depending on it. After this patch this number has shrunk to around 11.
In the last 90 days, KeyframeEffectModel.h was modified 13 times on
trunk, which is a relatively high number.

KeyframeEffectModel.h also pulls in a large amount of other animation
headers so they should see similar benefits.

Review URL: https://codereview.chromium.org/346803002

git-svn-id: svn://svn.chromium.org/blink/trunk@176517 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/css/resolver/StyleResolver.h

@@ -22,7 +22,6 @@
 #ifndef StyleResolver_h
 #define StyleResolver_h
 
-#include "core/animation/KeyframeEffectModel.h"
 #include "core/css/PseudoStyleRequest.h"
 #include "core/css/RuleFeature.h"
 #include "core/css/RuleSet.h"
@@ -45,6 +44,8 @@
 
 namespace WebCore {
 
+class AnimatableValue;
+class AnimationTimeline;
 class CSSAnimationUpdate;
 class CSSFontSelector;
 class CSSRuleList;
@@ -53,9 +54,9 @@ class CSSStyleSheet;
 class CSSValue;
 class ContainerNode;
 class Document;
-class AnimationTimeline;
 class Element;
 class ElementRuleCollector;
+class Interpolation;
 class KeyframeList;
 class KeyframeValue;
 class MediaQueryEvaluator;