UserAgent: Mozilla/5.0 (X11; Linux mips64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3096.2 Safari/537.36

Steps to reproduce the problem:
1. build base_unittests
2. run base_unittests

What is the expected behavior?
passed this test case.

What went wrong?
Note: Google Test filter = PartitionAllocTest.PartialPageFreelists
[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from PartitionAllocTest
[ RUN      ] PartitionAllocTest.PartialPageFreelists
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:832: Failure
Value of: big_size + kExtraAllocSize
  Actual: 4088
Expected: kSystemPageSize - kAllocationGranularity
Which is: 16376
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:845: Failure
Value of: totalSlots
  Actual: 16
Expected: 4u
Which is: 4
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:851: Failure
Value of: page->num_unprovisioned_slots
  Actual: 11
Expected: 2
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:855: Failure
Value of: page->freelist_head
  Actual: true
Expected: false
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:857: Failure
Value of: page->num_unprovisioned_slots
  Actual: 11
Expected: 2
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:863: Failure
Value of: page->num_unprovisioned_slots
  Actual: 11
Expected: 0
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:867: Failure
Value of: page->freelist_head
  Actual: true
Expected: false
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:869: Failure
Value of: page->num_unprovisioned_slots
  Actual: 11
Expected: 0
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:876: Failure
Value of: page2->num_allocated_slots
  Actual: 5
Expected: 1
Program received signal SIGSEGV, Segmentation fault.
0x000000aaabfaacb8 in PartitionBucketAlloc (bucket=0xaaacbcb630 <(anonymous namespace)::g_tls_metadata+1296>, size=8192, flags=0, 
    root=0xaaacbc3548 <base::(anonymous namespace)::allocator>) at ../../base/allocator/partition_allocator/partition_alloc.h:666
666       void* ret = page->freelist_head;

Did this work before? N/A 

Does this work in other browsers? N/A

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