tcmalloc: Initialize DefaultSysAllocator::names_
tcmalloc: Initialize DefaultSysAllocator::names_

When DefaultSysAllocator::Alloc fails, it prints a message.
This message passes NULL to a printf-like function, so it
prints "(null)" in the message.  It was clearly intended to
print "SbrkSysAllocator" or "MmapSysAllocator" in that place.

BUG= none
TEST= none

R=glider@chromium.org,sehr@google.com,bradchen@google.com


Review URL: http://codereview.chromium.org/8474003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@108927 0039d316-1c4b-4281-b951-d872f2087c98

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