What was the major version when the webkit version was 528.17?
CREATE TABLE "windows" (
  "major_version" text,
  "minor_version" text,
  "web_kit_version" text,
  "operating_system" text,
  "release_date" text,
  "features" text
);
SELECT "major_version" FROM "windows" WHERE "web_kit_version"='528.17';