Fix interaction between ASAN and PartitionAlloc.

We now adhere to the expected contract of crashing upon allocation failure.

BUG=271306

Review URL: https://chromiumcodereview.appspot.com/23304017

git-svn-id: svn://svn.chromium.org/blink/trunk@156721 bbb929c8-8fbe-4397-9dbb-9b2b20218538