Do the early return when role is different than UnknownRole.

Source/modules/accessibility/AXTableRow.cpp

Index: Source/modules/accessibility/AXTableRow.cpp
diff --git a/Source/modules/accessibility/AXTableRow.cpp b/Source/modules/accessibility/AXTableRow.cpp
index 32a4e7f9cb3cb0878b0157be18b679009bc9d12c..35922fdd898d8953d9f385f7e82f96ac4c15aaca 100644
--- a/Source/modules/accessibility/AXTableRow.cpp
+++ b/Source/modules/accessibility/AXTableRow.cpp
@@ -56,11 +56,8 @@ AccessibilityRole AXTableRow::determineAccessibilityRole()
     if (!isTableRow())
         return AXRenderObject::determineAccessibilityRole();
 
-    m_ariaRole = determineAriaRoleAttribute();
-
-    AccessibilityRole ariaRole = ariaRoleAttribute();
-    if (ariaRole != UnknownRole)
-        return ariaRole;
+    if ((m_ariaRole = determineAriaRoleAttribute()) != UnknownRole)
+        return m_ariaRole;
 
     return RowRole;
 }