Return true when file size is zero.

base/test/test_file_util_mac.cc

Index: base/test/test_file_util_mac.cc
diff --git a/base/test/test_file_util_mac.cc b/base/test/test_file_util_mac.cc
index 316b5c3d01aa9aec7c42d64bce64be95cd0b0969..409781cea9bcdedc2bbc34daa737a93f1509e308 100644
--- a/base/test/test_file_util_mac.cc
+++ b/base/test/test_file_util_mac.cc
@@ -17,6 +17,12 @@ bool EvictFileFromSystemCache(const FilePath& file) {
   // default) + MAP_SHARED, then do an msync to invalidate the memory.  The next
   // open should then have to load the file from disk.
 
+  int64 length;

[kkania, 2011/07/22 23:48:58]

add a comment why this is needed

[Huyen, 2011/07/23 00:00:36]

Done.

+  file_util::GetFileSize(file, &length);

[kkania, 2011/07/22 23:48:58]

This could fail. log a warning and return false.

[Huyen, 2011/07/23 00:00:36]

Done.

+  if (length == 0) {

[kkania, 2011/07/22 23:48:58]

if (!length)
  return true;

[Huyen, 2011/07/23 00:00:36]

Done.

+    return true;
+  }
+
   file_util::MemoryMappedFile mapped_file;
   if (!mapped_file.Initialize(file)) {
     DLOG(WARNING) << "failed to memory map " << file.value();