Rename StyleSheetCollections to StyleEngine.

Source/core/page/Page.cpp

Index: Source/core/page/Page.cpp
diff --git a/Source/core/page/Page.cpp b/Source/core/page/Page.cpp
index 09a0158f5ebff74208ff41e3d2e6fb6e3f36342a..d1b954d47f6a5cac561efced0c18c2cab0a900eb 100644
--- a/Source/core/page/Page.cpp
+++ b/Source/core/page/Page.cpp
@@ -24,7 +24,7 @@
 #include "core/dom/DocumentMarkerController.h"
 #include "core/dom/Event.h"
 #include "core/dom/EventNames.h"
-#include "core/dom/StyleSheetCollections.h"
+#include "core/dom/StyleEngine.h"
 #include "core/dom/VisitedLinkState.h"
 #include "core/editing/Caret.h"
 #include "core/history/BackForwardController.h"
@@ -463,7 +463,7 @@ void Page::userStyleSheetLocationChanged()
 
     for (Frame* frame = mainFrame(); frame; frame = frame->tree()->traverseNext()) {
         if (frame->document())
-            frame->document()->styleSheetCollections()->updatePageUserSheet();
+            frame->document()->styleEngine()->updatePageUserSheet();
     }
 }