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

ui/keyboard/keyboard.gyp

 # Copyright (c) 2013 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,
   },
   'targets': [
     {
@@ skipping 81 matching lines @@
         '../gfx/gfx.gyp:gfx_geometry',
         '../resources/ui_resources.gyp:ui_test_pak',
         '../wm/wm.gyp:wm',
         'keyboard',
       ],
       'sources': [
         'test/run_all_unittests.cc',
         'keyboard_controller_unittest.cc',
       ],
       'conditions': [
-        # TODO(dmikurube): Kill linux_use_tcmalloc. http://crbug.com/345554
-        ['OS=="linux" and ((use_allocator!="none" and use_allocator!="see_use_tcmalloc") or (use_allocator=="see_use_tcmalloc" and linux_use_tcmalloc==1))', {
+        ['OS=="linux" and use_allocator!="none"', {
           'dependencies': [
             '<(DEPTH)/base/allocator/allocator.gyp:allocator',
           ],
           'link_settings': {
             'ldflags': ['-rdynamic'],
           },
         }],
         ['OS=="win" and win_use_allocator_shim==1', {
           'dependencies': [
             '<(DEPTH)/base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
     },
   ],
 }