Rename StyleSheetCollections to StyleEngine.

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 20ac848e9a9f987fb9c129701384f866ca3664a1..e20183c50b656d296faa1ff2ea5a7c489e05597f 100644
--- a/Source/core/rendering/RenderBlock.cpp
+++ b/Source/core/rendering/RenderBlock.cpp
@@ -6018,7 +6018,7 @@ LayoutUnit RenderBlock::lineHeight(bool firstLine, LineDirectionMode direction,
     if (isReplaced() && linePositionMode == PositionOnContainingLine)
         return RenderBox::lineHeight(firstLine, direction, linePositionMode);
 
-    if (firstLine && document().styleSheetCollections()->usesFirstLineRules()) {
+    if (firstLine && document().styleEngine()->usesFirstLineRules()) {
         RenderStyle* s = style(firstLine);
         if (s != style())
             return s->computedLineHeight(view());
@@ -6357,7 +6357,7 @@ void RenderBlock::createFirstLetterRenderer(RenderObject* firstLetterBlock, Rend
 
 void RenderBlock::updateFirstLetter()
 {
-    if (!document().styleSheetCollections()->usesFirstLetterRules())
+    if (!document().styleEngine()->usesFirstLetterRules())
         return;
     // Don't recur
     if (style()->styleType() == FIRST_LETTER)