Revert 126020 - Experiment for updating the tcmalloc chromium branch to r144 (gperftools 2.0).

third_party/tcmalloc/chromium/src/base/spinlock_win32-inl.h

Index: third_party/tcmalloc/chromium/src/base/spinlock_win32-inl.h
===================================================================
--- third_party/tcmalloc/chromium/src/base/spinlock_win32-inl.h	(revision 126022)
+++ third_party/tcmalloc/chromium/src/base/spinlock_win32-inl.h	(working copy)
@@ -42,13 +42,6 @@
   } else if (loop == 1) {
     Sleep(0);
   } else {
-    // TODO(dmikurube): Re-enable the commented-out code.
-    // We commented out the following line and used the old code "Sleep(1)"
-    // since base/atomicops-internals-windows.h doesn't support 64-bit
-    // operations.
-    //
-    // Commended-out code:
-    //   Sleep(base::internal::SuggestedDelayNS(loop) / 1000000);
     Sleep(1);
   }
 }