Convert ARRAYSIZE_UNSAFE -> arraysize in base/.

base/debug/proc_maps_linux_unittest.cc

Index: base/debug/proc_maps_linux_unittest.cc
diff --git a/base/debug/proc_maps_linux_unittest.cc b/base/debug/proc_maps_linux_unittest.cc
index fc8ced6aa057a3e9bf81571c98b014e56a11620c..4be5a0f5d50d2e72380c16374de3ff2aff75d1a9 100644
--- a/base/debug/proc_maps_linux_unittest.cc
+++ b/base/debug/proc_maps_linux_unittest.cc
@@ -167,7 +167,7 @@ TEST(ProcMapsTest, Permissions) {
          MappedMemoryRegion::EXECUTE | MappedMemoryRegion::PRIVATE},
   };
 
-  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kTestCases); ++i) {
+  for (size_t i = 0; i < arraysize(kTestCases); ++i) {
     SCOPED_TRACE(
         base::StringPrintf("kTestCases[%zu] = %s", i, kTestCases[i].input));