Reland: Refactor and shorten in-memory cache.

net/net.gypi

 # Copyright 2014 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.
 
 # This file is shared between the regular GYP build, the NaCl GYP build, and
 # the GN build. For GN support, it must have no conditionals or anything like
 # that beyond the simple one-level-deep dictionary of values.
 {
   'variables': {
     # Subset of net source files that are compiled for NaCl (net_nacl target).
@@ skipping 708 matching lines @@
       'disk_cache/cache_creator.cc',
       'disk_cache/cache_util.cc',
       'disk_cache/cache_util.h',
       'disk_cache/cache_util_posix.cc',
       'disk_cache/cache_util_win.cc',
       'disk_cache/disk_cache.h',
       'disk_cache/memory/mem_backend_impl.cc',
       'disk_cache/memory/mem_backend_impl.h',
       'disk_cache/memory/mem_entry_impl.cc',
       'disk_cache/memory/mem_entry_impl.h',
-      'disk_cache/memory/mem_rankings.cc',
-      'disk_cache/memory/mem_rankings.h',
       'disk_cache/net_log_parameters.cc',
       'disk_cache/net_log_parameters.h',
       'disk_cache/simple/simple_backend_impl.cc',
       'disk_cache/simple/simple_backend_impl.h',
       'disk_cache/simple/simple_backend_version.h',
       'disk_cache/simple/simple_entry_format.cc',
       'disk_cache/simple/simple_entry_format.h',
       'disk_cache/simple/simple_entry_format_history.h',
       'disk_cache/simple/simple_entry_impl.cc',
       'disk_cache/simple/simple_entry_impl.h',
@@ skipping 1252 matching lines @@
       'docs/bug-triage-labels.md',
       'docs/bug-triage-suggested-workflow.md',
       'docs/code-patterns.md',
       'docs/crash-course-in-net-internals.md',
       'docs/life-of-a-url-request.md',
       'sdch/README.md',
     ],
     'net_docs_output_dir': '<(PRODUCT_DIR)/net/docs',
   }
 }