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When the ram_vs_swap_weight file is not available, the ram_swap_weight
varialbe is zero. CalculateAvailableMemoryUserSpaceKB uses the
ram_swap_weight variable as denominator and crashes. Always set
ram_swap_weight to non-zero value to avoid the dividing by zero issue.

Bug: b/171033232
Change-Id: I82e2cfd28ea21e57f3e6dd40f8cd68ee9f265c4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2503914
Commit-Queue: Brian Geffon <bgeffon@chromium.org>
Reviewed-by: Brian Geffon <bgeffon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821714}