Fix CalculateGeneratorInputInfo for "xcode-ninja" generator.
Fix CalculateGeneratorInputInfo for "xcode-ninja" generator.

The function CalculateGeneratorInputInfo() was broken during patchset #2
of https://codereview.chromium.org/1477333003 (code setting the global
should have been unindented).

Fix the function to always set generator_filelist_paths whatever the
flavour of "xcode" generator (vanilla or "ninja") is used.

BUG=chromium:562135
R=mark@chromium.org

Review URL: https://codereview.chromium.org/1485103002 .

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