Rolling to leveldb rev which reuses manifest/log.

DEPS

 # This file is used to manage the dependencies of the Chromium src repo. It is
 # used by gclient to determine what version of each dependency to check out, and
 # where.
 #
 # For more information, please refer to the official documentation:
 #   https://sites.google.com/a/chromium.org/dev/developers/how-tos/get-the-code
 #
 # When adding a new dependency, please update the top-level .gitignore file
 # to list the dependency's destination directory.
 #
@@ skipping 136 matching lines @@
   'src/third_party/hunspell_dictionaries':
    Var('chromium_git') + '/chromium/deps/hunspell_dictionaries.git' + '@' + '4560bdd463a3500e2334e85c8a0e9e5d5d6774e7',
 
   'src/third_party/safe_browsing/testing':
     Var('chromium_git') + '/external/google-safe-browsing/testing.git' + '@' + '9d7e8064f3ca2e45891470c9b5b1dce54af6a9d6',
 
   'src/third_party/cacheinvalidation/src':
     Var('chromium_git') + '/external/google-cache-invalidation-api/src.git' + '@' + 'c91bd9d9fed06bf440be64f87b94a2effdb32bc4', # from svn revision 341
 
   'src/third_party/leveldatabase/src':
-    Var('chromium_git') + '/external/leveldb.git' + '@' + '803d69203a62faf50f1b77897310a3a1fcae712b',
+    Var('chromium_git') + '/external/leveldb.git' + '@' + '251ebf5dc70129ad3c38193fe6c99a5b0ec6b9fa',
 
   'src/third_party/libc++/trunk':
    Var('chromium_git') + '/chromium/llvm-project/libcxx.git' + '@' +  Var('libcxx_revision'),
 
   'src/third_party/libc++abi/trunk':
    Var('chromium_git') + '/chromium/llvm-project/libcxxabi.git' + '@' +  Var('libcxxabi_revision'),
 
   'src/third_party/snappy/src':
     Var('chromium_git') + '/external/snappy.git' + '@' + '762bb32f0c9d2f31ba4958c7c0933d22e80c20bf',
 
@@ skipping 614 matching lines @@
     # corresponding .py files have already been deleted.
     'name': 'remove_stale_pyc_files',
     'pattern': 'src/tools/.*\\.py',
     'action': [
         'python',
         'src/tools/remove_stale_pyc_files.py',
         'src/tools',
     ],
   },
 ]