Remove {linux|android}_use_tcmalloc and switch to use_allocator in Chromium.

ash/ash.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,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
   },
   'includes': [
@@ skipping 1049 matching lines @@
             '../ui/display/display.gyp:display_types',
           ],
           'sources': [
             'first_run/first_run_helper_unittest.cc',
           ],
         }, { # else: chromeos!=1
           'sources/': [
             ['exclude', 'display/resolution_notification_controller_unittest.cc'],
           ],
         }],
-        # TODO(dmikurube): Kill linux_use_tcmalloc. http://crbug.com/345554
-        ['OS=="linux" and component=="shared_library" and ((use_allocator!="none" and use_allocator!="see_use_tcmalloc") or (use_allocator=="see_use_tcmalloc" and linux_use_tcmalloc==1))', {
+        ['OS=="linux" and component=="shared_library" and use_allocator!="none"', {
           'dependencies': [
             '<(DEPTH)/base/allocator/allocator.gyp:allocator',
           ],
           'link_settings': {
             'ldflags': ['-rdynamic'],
           },
         }],
         ['use_ozone==1', {
           'sources!': [
             'sticky_keys/sticky_keys_unittest.cc',  # crbug.com/354035
@@ skipping 110 matching lines @@
         'ash_shell_lib',
         'ash_test_support',
       ],
       'sources': [
         'shell/window_watcher_unittest.cc',
         'test/ash_unittests.cc',
       ],
     },
   ],
 }