Omit "int" when using "unsigned" modifier

Source/core/editing/MarkupAccumulator.cpp

Index: Source/core/editing/MarkupAccumulator.cpp
diff --git a/Source/core/editing/MarkupAccumulator.cpp b/Source/core/editing/MarkupAccumulator.cpp
index 0dd6adf8c8282d0b840bcda4951a3b8a1a8310e8..1ca35669aa1c4116d91cf226a32a892f117bcbd9 100644
--- a/Source/core/editing/MarkupAccumulator.cpp
+++ b/Source/core/editing/MarkupAccumulator.cpp
@@ -394,7 +394,7 @@ void MarkupAccumulator::appendElement(StringBuilder& result, Element& element, N
 
     if (element.hasAttributes()) {
         unsigned length = element.attributeCount();
-        for (unsigned int i = 0; i < length; i++)
+        for (unsigned i = 0; i < length; i++)
             appendAttribute(result, element, element.attributeItem(i), namespaces);
     }