Avoid bloating characters when parsing IndexedDB key paths
Avoid bloating characters when parsing IndexedDB key paths

The parser was doing UChar pointer arithmetic, forcing
upconversion of 8-bit strings. Do index arithmetic instead
to avoid this.

BUG=254708
R=abarth@chromium.org

Review URL: https://chromiumcodereview.appspot.com/18029010

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@153180 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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