Fix %xx normalization in parserTests.

In commit 73aef888223820cedded89523177c361ef3d3ec3 I attempted to fix this,
but I used the wrong function, with the result that UTF-8 characters were
mangled.  decodeURIComponent does the proper UTF-8 decoding.  One more
test passes!

Change-Id: Ib36863fcb791b515a887c7d360602c584fc13220
Merge "Fix %xx normalization in parserTests."