Move hash.h/cc from net/disk_cache to base.

net/net.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'chromium_code': 1,
 
     'linux_link_kerberos%': 0,
     'conditions': [
@@ skipping 323 matching lines @@
         'disk_cache/eviction.cc',
         'disk_cache/eviction.h',
         'disk_cache/experiments.h',
         'disk_cache/file.cc',
         'disk_cache/file.h',
         'disk_cache/file_block.h',
         'disk_cache/file_lock.cc',
         'disk_cache/file_lock.h',
         'disk_cache/file_posix.cc',
         'disk_cache/file_win.cc',
-        'disk_cache/hash.cc',
-        'disk_cache/hash.h',
         'disk_cache/histogram_macros.h',
         'disk_cache/in_flight_backend_io.cc',
         'disk_cache/in_flight_backend_io.h',
         'disk_cache/in_flight_io.cc',
         'disk_cache/in_flight_io.h',
         'disk_cache/mapped_file.h',
         'disk_cache/mapped_file_posix.cc',
         'disk_cache/mapped_file_avoid_mmap_posix.cc',
         'disk_cache/mapped_file_win.cc',
         'disk_cache/mem_backend_impl.cc',
@@ skipping 1788 matching lines @@
                 '--result', '<@(_outputs)',
                 '--isolate', 'net_unittests.isolate',
               ],
             },
           ],
         },
       ],
     }],
   ],
 }