`make check` fail at HEAD in dumper_unittest

[Mitch Phillips]

Hi Breakpad devs,

Looks like I'm getting a failure on a unittest running `make check`. This is on an x86_64 72-core linux box when running `make check` at 0c0e24f709288a129d665ec27d6f089189318385.

[ RUN      ] SimpleCU.UnknownAbstractOrigin
../src/src/common/dwarf_cu_to_module_unittest.cc:775: Failure
Actual function call count doesn't match EXPECT_CALL(reporter_, UnnamedFunction(0x11c70f94c6e87ccdLL))...
         Expected: to be called once
           Actual: never called - unsatisfied and active
../src/src/common/dwarf_cu_to_module_unittest.cc:774: Failure
Actual function call count doesn't match EXPECT_CALL(reporter_, UnknownAbstractOrigin(_, 1ULL))...
         Expected: to be called once
           Actual: never called - unsatisfied and active
[  FAILED  ] SimpleCU.UnknownAbstractOrigin (0 ms)
[ RUN      ] Specifications.BadOffset
../src/src/common/dwarf_cu_to_module_unittest.cc:1625: Failure
Actual function call count doesn't match EXPECT_CALL(reporter_, UnknownSpecification(_, 0x2be953efa6f9a996ULL))...
         Expected: to be called once
           Actual: never called - unsatisfied and active
[  FAILED  ] Specifications.BadOffset (0 ms)
[  FAILED  ] 2 tests, listed below:
[  FAILED  ] SimpleCU.UnknownAbstractOrigin
[  FAILED  ] Specifications.BadOffset

Full log is attached. Any ideas?