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Leftover from the previous cleanups.
Previously, when base did pretend to not know anything about allocator,
tc_set_new_mode was invoked by the content layer (in content_main).
But this required this base unittest to mimic the same content behavior.

These days, instead, tc_set_new_mode() is called by base's
EnableTerminationOnOutOfMemory(). This test is already invoking
EnableTerminationOnOutOfMemory() in its initialization, so there is
no need to perform a 2nd call to tc_set_new_mode.

Also this makes the code in this test conceptually cleaner and smaller.

BUG=564618
TEST=base_unittests

Review URL: https://codereview.chromium.org/1683153002

Cr-Commit-Position: refs/heads/master@{#374750}