disk_cache_memory_test: accept smaps file commonly found on Android 4.4

Some of the new attributes of a mapping on Android 4.4 /proc/pid/smaps are
produced in the form of "Name:   [anon:libc_malloc]". Just skip them as we do
with irrelevant KB numbers.

BUG=none
TBR=gavinp

Review URL: https://codereview.chromium.org/88813003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237575 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237575