Revert 10413-10416 initial memory use reduction due to

src/platform-macos.cc

Index: src/platform-macos.cc
===================================================================
--- src/platform-macos.cc	(revision 10413)
+++ src/platform-macos.cc	(working copy)
@@ -473,14 +473,20 @@
   pthread_t thread_;  // Thread handle for pthread.
 };
 
-
 Thread::Thread(const Options& options)
     : data_(new PlatformData),
-      stack_size_(options.stack_size()) {
-  set_name(options.name());
+      stack_size_(options.stack_size) {
+  set_name(options.name);
 }
 
 
+Thread::Thread(const char* name)
+    : data_(new PlatformData),
+      stack_size_(0) {
+  set_name(name);
+}
+
+
 Thread::~Thread() {
   delete data_;
 }
@@ -730,13 +736,10 @@
   thread_act_t profiled_thread_;
 };
 
-
 class SamplerThread : public Thread {
  public:
-  static const int kSamplerThreadStackSize = 32 * KB;
-
   explicit SamplerThread(int interval)
-      : Thread(Thread::Options("SamplerThread", kSamplerThreadStackSize)),
+      : Thread("SamplerThread"),
         interval_(interval) {}
 
   static void AddActiveSampler(Sampler* sampler) {