Enable TCMalloc on Linux by default.

base/base.gyp

 # Copyright (c) 2009 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 367 matching lines @@
       'msvs_disabled_warnings': [
         4244, 4554, 4018, 4102,
       ],
       'mac_framework_dirs': [
         '$(SDKROOT)/System/Library/Frameworks/ApplicationServices.framework/Frameworks',
       ],
       'conditions': [
         [ 'OS == "linux" or OS == "freebsd"', {
             'sources/': [ ['exclude', '_(mac|win|chromeos)\\.cc$'],
                           ['exclude', '\\.mm?$' ] ],
-            'variables' : {
-              'linux_use_heapchecker%' : 0,
-            },
             'conditions': [
               [ 'chromeos==1 or toolkit_views==1', {
                   'sources/': [ ['include', '_chromeos\\.cc$'] ]
                 },
               ],
-              [ 'linux_use_heapchecker==1', {
-                  'defines': [
-                    'LINUX_USE_HEAPCHECKER',
-                  ],
-                  'direct_dependent_settings': {
-                    'defines': [
-                      'LINUX_USE_HEAPCHECKER',
-                    ],
-                  },
-                },
-              ],
-              # linux_use_heapchecker==1 implies linux_use_tcmalloc=1.
-              [ 'linux_use_tcmalloc==1 or linux_use_heapchecker==1', {
-                  'dependencies': [
-                    '../third_party/tcmalloc/tcmalloc.gyp:tcmalloc',
-                  ],
+              [ 'linux_use_tcmalloc==1', {
                   'defines': [
                     'LINUX_USE_TCMALLOC',
                   ],
                   'direct_dependent_settings': {
                     'defines': [
                       'LINUX_USE_TCMALLOC',
                     ],
                   },
                 },
               ],
@@ skipping 263 matching lines @@
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
       ],
       'conditions': [
         ['OS == "linux" or OS == "freebsd"', {
           'sources/': [ ['exclude', '\\.mm?$' ] ],
           'sources!': [
             'file_version_info_unittest.cc',
             'worker_pool_linux_unittest.cc',
           ],
+          'conditions': [
+            [ 'linux_use_tcmalloc==1', {
+                'dependencies': [
+                  '../third_party/tcmalloc/tcmalloc.gyp:tcmalloc',
+                ],
+              },
+            ],
+          ],
           'dependencies': [
             '../build/linux/system.gyp:gtk',
             '../build/linux/system.gyp:nss',
             '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
           ],
         }, {  # OS != "linux" and OS != "freebsd"
           'sources!': [
             'message_pump_glib_unittest.cc',
           ]
         }],
@@ skipping 164 matching lines @@
       ],
     }],
   ],
 }
 
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