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It appears the MemoryInstrumentation singleton can be null in UMA
logging code, possibly because this runs prior to //content
initialization. There's no memory metrics to log in this case, so we
work around this by null-checking the singleton and exiting early.

Fixed: 1140173
Test: None
Change-Id: Id5e783dd068381dac1d7ac48b86764acc54ed620
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533738
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827121}