Cast highestEnclosingNodeOfType() return value to tighter type

Source/core/editing/EditingStyle.cpp

Index: Source/core/editing/EditingStyle.cpp
diff --git a/Source/core/editing/EditingStyle.cpp b/Source/core/editing/EditingStyle.cpp
index 5c45b7a9aebca45930aa9adf4c5f530e4a59c1b9..03bedd5da57aa78ac06a2e134130d1a26b961e6b 100644
--- a/Source/core/editing/EditingStyle.cpp
+++ b/Source/core/editing/EditingStyle.cpp
@@ -1067,7 +1067,7 @@ PassRefPtrWillBeRawPtr<EditingStyle> EditingStyle::wrappingStyleForSerialization
         // Styles that Mail blockquotes contribute should only be placed on the Mail blockquote,
         // to help us differentiate those styles from ones that the user has applied.
         // This helps us get the color of content pasted into blockquotes right.
-        wrappingStyle->removeStyleAddedByNode(enclosingNodeOfType(firstPositionInOrBeforeNode(context), isMailBlockquote, CanCrossEditingBoundary));
+        wrappingStyle->removeStyleAddedByNode(enclosingNodeOfType(firstPositionInOrBeforeNode(context), isMailHTMLBlockquoteElement, CanCrossEditingBoundary));
 
         // Call collapseTextDecorationProperties first or otherwise it'll copy the value over from in-effect to text-decorations.
         wrappingStyle->collapseTextDecorationProperties();
@@ -1079,7 +1079,7 @@ PassRefPtrWillBeRawPtr<EditingStyle> EditingStyle::wrappingStyleForSerialization
 
     // When not annotating for interchange, we only preserve inline style declarations.
     for (Node* node = context; node && !node->isDocumentNode(); node = node->parentNode()) {
-        if (node->isStyledElement() && !isMailBlockquote(node)) {
+        if (node->isStyledElement() && !isMailHTMLBlockquoteElement(node)) {
             wrappingStyle->mergeInlineAndImplicitStyleOfElement(toElement(node), EditingStyle::DoNotOverrideValues,
                 EditingStyle::EditingPropertiesInEffect);
         }