Revert "Do fcntl(...F_FULLFSYNC...) on mac instead of fsync"

This reverts commit r221413.

Original CL: https://src.chromium.org/viewvc/chrome?revision=221413&view=revision

BUG=286266
NOTRY=true
TBR=dgrogan@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23538008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221702 0039d316-1c4b-4281-b951-d872f2087c98

third_party/leveldatabase/env_chromium.cc

@@ -68,8 +68,6 @@ int fflush_wrapper(FILE *file) {
 int fdatasync(int fildes) {
 #if defined(OS_WIN)
   return _commit(fildes);
-#elif defined(OS_MACOSX)
-  return HANDLE_EINTR(fcntl(fildes, F_FULLFSYNC, 0));
 #else
   return HANDLE_EINTR(fsync(fildes));
 #endif
@@ -517,7 +515,7 @@ Status ChromiumWritableFile::Sync() {
     error = errno;
   // Sync even if fflush gave an error; perhaps the data actually got out,
   // even though something went wrong.
-  if (fdatasync(fileno(file_)) == -1 && !error)
+  if (fdatasync(fileno(file_)) && !error)
     error = errno;
   // Report the first error we found.
   if (error) {