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Use the timer interface from base/ instead.

This removes a dependency on nacl_time.h from native_client/, which is
#included indirectly in utility.h.

I tested this manually by adding some logging to print the times, and
I checked that they're roughly the same before and after the change
when running NaClBrowserTestPnacl.PPAPICore (which tests PNaCl
translation).

BUG= https://bugs.chromium.org/p/nativeclient/issues/detail?id=2832
TEST=see above

Review URL: https://codereview.chromium.org/1636303002

Cr-Commit-Position: refs/heads/master@{#371823}