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Both JSONParser and JSONValues use constants for the strings
"null", "true" and "false". That is probably no problem since the
linker will merge identical strings, but since the constants had
the same names as well they caused collisions in jumbo builds.

This patch makes JSONParser use the JSONValues constants.

Change-Id: I27b01b354aa9cfeab0f8c636f22ecfbc2762a6bc
Reviewed-on: https://chromium-review.googlesource.com/577552Reviewed-by: Ian Clelland <iclelland@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#488654}