linux: remove no_strict_aliasing gyp variable

base/base.gyp

 # Copyright (c) 2011 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,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 285 matching lines @@
           'sources!': [
             'file_version_info_unittest.cc',
           ],
           'conditions': [
             [ 'linux_use_tcmalloc==1', {
                 'dependencies': [
                   'allocator/allocator.gyp:allocator',
                 ],
               },
             ],
-            ['gcc_version==44', {
-              # Avoid gcc 4.4 strict aliasing issues in stl_tree.h when
-              # building mru_cache_unittest.cc.
-              'cflags': [
-                '-fno-strict-aliasing',
-              ],
-            }],
             [ 'toolkit_uses_gtk==1', {
               'sources': [
                 'nix/xdg_util_unittest.cc',
               ],
               'dependencies': [
                 '../build/linux/system.gyp:gtk',
               ]
             }],
           ],
           'dependencies': [
@@ skipping 148 matching lines @@
           'msvs_settings': {
             'VCLinkerTool': {
               'SubSystem': '2',         # Set /SUBSYSTEM:WINDOWS
             },
           },
         },
       ],
     }],
   ],
 }