Replace ASSERT_NOT_REACHED with NOTREACHED in build/scripts/templates/

BUG=707642

Review-Url: https://codereview.chromium.org/2847203002
Cr-Commit-Position: refs/heads/master@{#468453}

third_party/WebKit/Source/build/scripts/templates/StyleBuilder.cpp.tmpl

@@ -50,7 +50,7 @@ void StyleBuilder::ApplyProperty(CSSPropertyID property,
     {% endfor %}
       return;
     default:
-      ASSERT_NOT_REACHED();
+      NOTREACHED();
   }
 }