Rename StyleSheetCollections to StyleEngine.

Source/core/dom/ShadowTreeStyleSheetCollection.cpp

Index: Source/core/dom/ShadowTreeStyleSheetCollection.cpp
diff --git a/Source/core/dom/ShadowTreeStyleSheetCollection.cpp b/Source/core/dom/ShadowTreeStyleSheetCollection.cpp
index a0d7c843c7be885a76178eb621dc1b3027d548e3..a952d05b176c70e7009476b4233de4c4173fed7b 100644
--- a/Source/core/dom/ShadowTreeStyleSheetCollection.cpp
+++ b/Source/core/dom/ShadowTreeStyleSheetCollection.cpp
@@ -32,7 +32,7 @@
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
-#include "core/dom/StyleSheetCollections.h"
+#include "core/dom/StyleEngine.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/html/HTMLStyleElement.h"
 #include "core/page/Settings.h"
@@ -46,7 +46,7 @@ ShadowTreeStyleSheetCollection::ShadowTreeStyleSheetCollection(ShadowRoot& shado
 {
 }
 
-void ShadowTreeStyleSheetCollection::collectStyleSheets(StyleSheetCollections* collections, Vector<RefPtr<StyleSheet> >& styleSheets, Vector<RefPtr<CSSStyleSheet> >& activeSheets)
+void ShadowTreeStyleSheetCollection::collectStyleSheets(StyleEngine* collections, Vector<RefPtr<StyleSheet> >& styleSheets, Vector<RefPtr<CSSStyleSheet> >& activeSheets)
 {
     if (document()->settings() && !document()->settings()->authorAndUserStylesEnabled())
         return;
@@ -94,7 +94,7 @@ void ShadowTreeStyleSheetCollection::collectStyleSheets(StyleSheetCollections* c
     }
 }
 
-bool ShadowTreeStyleSheetCollection::updateActiveStyleSheets(StyleSheetCollections* collections, StyleResolverUpdateMode updateMode)
+bool ShadowTreeStyleSheetCollection::updateActiveStyleSheets(StyleEngine* collections, StyleResolverUpdateMode updateMode)
 {
     Vector<RefPtr<StyleSheet> > styleSheets;
     Vector<RefPtr<CSSStyleSheet> > activeCSSStyleSheets;