Add use_allocator instead of linux_use_tcmalloc to switch the allocator.

tools/cygprofile/cygprofile.cc

 // Copyright (c) 2011 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.
 //
 // Tool to log the execution of the process (Chrome). Writes logs containing
 // time and address of the callback being called for the first time.
 //
 // To speed up the logging, buffering logs is implemented. Every thread have its
 // own buffer and log file so the contention between threads is minimal. As a
 // side-effect, functions called might be mentioned in many thread logs.
 //
 // Special thread is created in the process to periodically flushes logs for all
 // threads for the case the thread has stopped before flushing its logs.
 //
-// Use this profiler with linux_use_tcmalloc=0.
+// Use this profiler with use_allocator!="none".
 //
 // Note for the ChromeOS Chrome. Remove renderer process from the sandbox (add
 // --no-sandbox option to running Chrome in /sbin/session_manager_setup.sh).
 // Otherwise renderer will not be able to write logs (and will assert on that).
 //
 // Also note that the instrumentation code is self-activated. It begins to
 // record the log data when it is called first, including the run-time startup.
 // Have it in mind when modifying it, in particular do not use global objects
 // with constructors as they are called during startup (too late for us).
 
@@ skipping 366 matching lines @@
     tls_current_log->LogEnter(this_fn);
   }
 }
 
 // Gcc Compiler callback, called after every function invocation providing
 // addresses of caller and callee codes.
 void __cyg_profile_func_exit(void* this_fn, void* call_site) {
 }
 
 }  // namespace cygprofile