Deleted OS_WIN and all Windows specific files from base.

base/threading/sequenced_worker_pool.cc

Index: base/threading/sequenced_worker_pool.cc
diff --git a/base/threading/sequenced_worker_pool.cc b/base/threading/sequenced_worker_pool.cc
index 7bbca92a2fb22d4bde9a50185a045faac004dea8..ffb369bd28d911e382f51744da952bfb46ce4a98 100644
--- a/base/threading/sequenced_worker_pool.cc
+++ b/base/threading/sequenced_worker_pool.cc
@@ -32,8 +32,6 @@
 
 #if defined(OS_MACOSX)
 #include "base/mac/scoped_nsautorelease_pool.h"
-#elif defined(OS_WIN)
-#include "base/win/scoped_com_initializer.h"
 #endif
 
 #if !defined(OS_NACL)
@@ -504,10 +502,6 @@ SequencedWorkerPool::Worker::~Worker() {
 }
 
 void SequencedWorkerPool::Worker::Run() {
-#if defined(OS_WIN)
-  win::ScopedCOMInitializer com_initializer;
-#endif
-
   // Store a pointer to the running sequence in thread local storage for
   // static function access.
   g_lazy_tls_ptr.Get().Set(&task_sequence_token_);