linux: don't define NO_HEAPCHECKER for every file

build/common.gypi

 # 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 2040 matching lines @@
             'cflags': [
               '-fno-strict-aliasing',
             ],
           }],
           ['linux_breakpad==1', {
             'cflags': [ '-g' ],
             'defines': ['USE_LINUX_BREAKPAD'],
           }],
           ['linux_use_heapchecker==1', {
             'variables': {'linux_use_tcmalloc%': 1},
+            'defines': ['USE_HEAPCHECKER'],
           }],
           ['linux_use_tcmalloc==0', {
             'defines': ['NO_TCMALLOC'],
           }],
-          ['linux_use_heapchecker==0', {
-            'defines': ['NO_HEAPCHECKER'],
-          }],
           ['linux_keep_shadow_stacks==1', {
             'defines': ['KEEP_SHADOW_STACKS'],
             'cflags': ['-finstrument-functions'],
           }],
         ],
       },
     }],
     # FreeBSD-specific options; note that most FreeBSD options are set above,
     # with Linux.
     ['OS=="freebsd"', {
@@ skipping 739 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }