Use sysctlbyname() to get kernel page size.

base/trace_event/process_memory_dump_unittest.cc

Index: base/trace_event/process_memory_dump_unittest.cc
diff --git a/base/trace_event/process_memory_dump_unittest.cc b/base/trace_event/process_memory_dump_unittest.cc
index cf87c94b1aa0c8f94256add34ec6fa8cd8025a6b..e7fe960cb11c2724f2ebb4bd29c037c6fef1b70a 100644
--- a/base/trace_event/process_memory_dump_unittest.cc
+++ b/base/trace_event/process_memory_dump_unittest.cc
@@ -223,7 +223,7 @@ TEST(ProcessMemoryDumpTest, GlobalAllocatorDumpTest) {
 
 #if defined(COUNT_RESIDENT_BYTES_SUPPORTED)
 TEST(ProcessMemoryDumpTest, CountResidentBytes) {
-  const size_t page_size = base::GetPageSize();
+  const size_t page_size = ProcessMemoryDump::GetSystemPageSize();
 
   // Allocate few page of dirty memory and check if it is resident.
   const size_t size1 = 5 * page_size;