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.PurgeDiscardable
[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from PartitionAllocTest
[ RUN      ] PartitionAllocTest.PurgeDiscardable
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:1942: Failure
Value of: stats->discardable_bytes
  Actual: 0
Expected: 2 * kSystemPageSize
Which is: 32768
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:1944: Failure
Value of: stats->resident_bytes
  Actual: 49152
Expected: 9 * kSystemPageSize
Which is: 147456
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:190: Failure
Value of: ret
  Actual: '\0'
Expected: inCore
Which is: true
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:190: Failure
Value of: ret
  Actual: '\0'
Expected: inCore
Which is: true
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:190: Failure
Value of: ret
  Actual: '\0'
Expected: inCore
Which is: true
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:190: Failure
Value of: ret
  Actual: '\x1' (1)
Expected: inCore
Which is: false
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:190: Failure
Value of: ret
  Actual: '\0'
Expected: inCore
Which is: true
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:190: Failure
Value of: ret
  Actual: '\0'
Expected: inCore
Which is: true
../../base/allocator/partition_allocator/partition_alloc_unittest.cc:1980: Failure
Value of: stats
  Actual: false
Expected: true
Program received signal SIGSEGV, Segmentation fault.
0x000000aaab0a9554 in testing::AssertionResult::AssertionResult<bool>(bool const&, testing::internal::EnableIf<!testing::internal::ImplicitlyConvertible<bool, testing::AssertionResult>::value>::type*) (this=0xffffffa6f0, success=@0x0: <error reading variable>) at ../../third_party/googletest/src/googletest/include/gtest/gtest.h:277
277           : success_(success) {}

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