No need for a foreach to remove keywords on a shader

ScriptableRenderPipeline/HDRenderPipeline/Editor/HDEditorUtils.cs

 
         public static void RemoveMaterialKeywords(Material material)
         {
-            foreach (var keyword in material.shaderKeywords)
-                material.DisableKeyword(keyword);
+            material.shaderKeywords = null;
         }
     }
 }