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This generates a proper version manifest for chrome.exe and also for the version assembly.

This adds a new way to get the chrome version info programatically at GN time. Although this adds another exec_script call, it removes four such calls in remoting so there is a net speed increase.

BUG=

Review URL: https://codereview.chromium.org/1250853007

Cr-Commit-Position: refs/heads/master@{#339833}