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This commit does not change behavior, other than adding new tests.

Also remove a couple of stale TODOs from the opening json_reader.h
comment, that proposed deviating further from the JSON spec. "git blame"
says that these TODOs were added by commit e724599d on 2008-07-29,
more than 11 years ago. They're not going to be done.

Bug: 1069271
Change-Id: I2e1221ca8054c7912fcdf2723d8e3e114a580898
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2139533
Commit-Queue: Nigel Tao <nigeltao@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758065}