Disable file operations on NACL builds.

base/metrics/persistent_memory_allocator_unittest.cc

Index: base/metrics/persistent_memory_allocator_unittest.cc
diff --git a/base/metrics/persistent_memory_allocator_unittest.cc b/base/metrics/persistent_memory_allocator_unittest.cc
index 5125ae6f322a141ff8a7d9e9e400a3a0ef7d264a..7307aeaf7fe156d4481f8919a73a001f5359b143 100644
--- a/base/metrics/persistent_memory_allocator_unittest.cc
+++ b/base/metrics/persistent_memory_allocator_unittest.cc
@@ -582,6 +582,7 @@ TEST(SharedPersistentMemoryAllocatorTest, CreationTest) {
 }
 
 
+#if !defined(OS_NACL)
 //----- FilePersistentMemoryAllocator ------------------------------------------
 
 TEST(FilePersistentMemoryAllocatorTest, CreationTest) {
@@ -784,5 +785,6 @@ TEST(FilePersistentMemoryAllocatorTest, AcceptableTest) {
     }
   }
 }
+#endif  // !defined(OS_NACL)
 
 }  // namespace base