Use 'local-exec' for threadlocal_heap_ in tcmalloc.

base/test/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 import("//build/config/nacl/config.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
@@ skipping 294 matching lines @@
   visibility = [ "//base/*" ]
   testonly = true
   sources = [
     "run_all_base_unittests.cc",
   ]
   deps = [
     ":test_support",
   ]
 }
 
-if (is_linux) {
+if (is_linux && is_component_build) {
   shared_library("malloc_wrapper") {
     testonly = true
     sources = [
       "malloc_wrapper.cc",
     ]
     deps = [
       "//base",
       "//build/config/sanitizers:deps",
     ]
   }
@@ skipping 40 matching lines @@
   }
 
   android_aidl("test_support_java_aidl") {
     testonly = true
     import_include = "android/java/src"
     sources = [
       "android/java/src/org/chromium/base/ITestClient.aidl",
     ]
   }
 }