Revert of Refactor thread_local.h's TLS Implementation to use ThreadLocalStorage

base/threading/thread_local_storage.h

Index: base/threading/thread_local_storage.h
diff --git a/base/threading/thread_local_storage.h b/base/threading/thread_local_storage.h
index dea76aa2d02440e6cc11c082c7f15783aaccccce..013b0aeffbbe3ce3710543d3a39b0a61d413213d 100644
--- a/base/threading/thread_local_storage.h
+++ b/base/threading/thread_local_storage.h
@@ -20,12 +20,9 @@
 
 namespace internal {
 
-// WARNING: You should *NOT* use this class directly.
-// PlatformThreadLocalStorage is a low-level abstraction of the OS's TLS
-// interface. Instead, you should use one of the following:
-// * ThreadLocalBoolean (from thread_local.h) for booleans.
-// * ThreadLocalPointer (from thread_local.h) for pointers.
-// * ThreadLocalStorage::StaticSlot/Slot for more direct control of the slot.
+// WARNING: You should *NOT* be using this class directly.
+// PlatformThreadLocalStorage is low-level abstraction to the OS's TLS
+// interface, you should instead be using ThreadLocalStorage::StaticSlot/Slot.
 class BASE_EXPORT PlatformThreadLocalStorage {
  public: