Revert 125441 - In CrMallocErrorBreak, do not kill the process if errno is ENOMEM.

Revert 125441 - In CrMallocErrorBreak, do not kill the process if errno is ENOMEM.

[Caused test failures on 10.5.]

This will allow large JPEG decodes to be handled and optionally killed by the
OOM killer instead. Based on a sampling of the other malloc_error_break() bugs
("unaligned pointer", "freed was not allocated", "double free", and "incorrect
checksum"), this will only affect the "allocate region" error, as those others
happen at free(), rather than malloc().

BUG=103980
TEST=Covered by ProcessUtilTest.MacTerminateOnHeapCorruption


Review URL: http://codereview.chromium.org/9597031

TBR=rsesek@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=125464