base: Use std::move() instead of Pass() for real movable types.

base/files/memory_mapped_file_unittest.cc

Index: base/files/memory_mapped_file_unittest.cc
diff --git a/base/files/memory_mapped_file_unittest.cc b/base/files/memory_mapped_file_unittest.cc
index 05b941c308af2d8b3ae5e0d28e4e5e1425386acb..1812d884faa8db86071452f97c22b0cf94064969 100644
--- a/base/files/memory_mapped_file_unittest.cc
+++ b/base/files/memory_mapped_file_unittest.cc
@@ -18,7 +18,7 @@ scoped_ptr<uint8[]> CreateTestBuffer(size_t size, size_t offset) {
   scoped_ptr<uint8[]> buf(new uint8[size]);
   for (size_t i = 0; i < size; ++i)
     buf.get()[i] = static_cast<uint8>((offset + i) % 253);
-  return buf.Pass();
+  return buf;
 }
 
 // Check that the watermark sequence is consistent with the |offset| provided.