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

ui/app_list/app_list.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,
   },
   'targets': [
     {
@@ skipping 240 matching lines @@
               # Needed to link to Obj-C static libraries.
               'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-ObjC']},
             }],
           ],
         }, {  # OS!="mac"
           'sources/': [
             ['exclude', 'cocoa/'],
           ],
         }],
         # See http://crbug.com/162998#c4 for why this is needed.
-        # 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': [
             '../../base/allocator/allocator.gyp:allocator',
             # The following two dependencies provide the missing
             # symbol HeapProfilerStart in Linux component builds.
             # They probably can be removed after http://crbug.com/263316
             '../../webkit/child/webkit_child.gyp:webkit_child',
           ],
         }],
         ['OS=="win" and win_use_allocator_shim==1', {
           'dependencies': [
             '../../base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
       # Disable c4267 warnings until we fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }