[base] POSIX File::Unlock() didn't actually unlock file.

base/base.gyp

Index: base/base.gyp
diff --git a/base/base.gyp b/base/base.gyp
index 69ff8bdd30e4e67809ed316c9d296c02855aa2f2..6fdbaf8cc896abd8e237171bdb38f08cc68f9b39 100644
--- a/base/base.gyp
+++ b/base/base.gyp
@@ -472,6 +472,7 @@
         'feature_list_unittest.cc',
         'file_version_info_unittest.cc',
         'files/dir_reader_posix_unittest.cc',
+        'files/file_locking_unittest.cc',
         'files/file_path_unittest.cc',
         'files/file_path_watcher_unittest.cc',
         'files/file_proxy_unittest.cc',
@@ -699,6 +700,8 @@
         }],
         ['OS == "ios" and _toolset != "host"', {
           'sources/': [
+            # This test needs multiple processes.
+            ['exclude', '^files/file_locking_unittest\\.cc$'],
             # iOS does not support FilePathWatcher.
             ['exclude', '^files/file_path_watcher_unittest\\.cc$'],
             # Only test the iOS-meaningful portion of memory and process_utils.