IndexedDB: Remove shim methods now that Chromium is updated to use enums
IndexedDB: Remove shim methods now that Chromium is updated to use enums

Following Chromium r249829 these temporary methods are no longer needed.

Review URL: https://codereview.chromium.org/153443003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@166889 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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