Rename RenderStyle::diff and RenderStyle::compare to better names

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 906a00cb648fe8b3367e9422eecb80b449c3e92e..e0dce153cc8b314ae8ffcf00d5dc9a742227cb9a 100644
--- a/Source/core/rendering/RenderBlock.cpp
+++ b/Source/core/rendering/RenderBlock.cpp
@@ -4070,7 +4070,7 @@ void RenderBlock::updateFirstLetterStyle(RenderObject* firstLetterBlock, RenderO
     RenderStyle* pseudoStyle = styleForFirstLetter(firstLetterBlock, firstLetterContainer);
     ASSERT(firstLetter->isFloating() || firstLetter->isInline());
 
-    if (RenderStyle::compare(firstLetter->style(), pseudoStyle) == Reattach) {
+    if (RenderStyle::stylePropogationDiff(firstLetter->style(), pseudoStyle) == Reattach) {
         // The first-letter renderer needs to be replaced. Create a new renderer of the right type.
         RenderBoxModelObject* newFirstLetter;
         if (pseudoStyle->display() == INLINE)