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This change adds a new file "Last Path" to the user-data directory
containing the path of the last chrome.exe that ran using it. The
implementation mimics the "Last Version" file implementation, so the
last-run chrome.exe path is updated each time chrome.exe is launched.

This will be used by Progressive Web Apps, whose launcher executables
will be located inside the user-data directory, to find the correct
chrome.exe to launch.


Bug: 960245
Change-Id: I0ec658d414dd1a67f03f7d02e645f21f03191360
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1891121Reviewed-by: Greg Thompson <grt@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Jay Harris <harrisjay@chromium.org>
Commit-Queue: Jesse McKenna <jessemckenna@google.com>
Cr-Commit-Position: refs/heads/master@{#715031}