Cleanup: given that TLS slot can't fail to initialize, remove bool return values

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 ea41b3473b9d70d65999e1d404f021c7442902f1..50f88685a57ba43c1b8c3d6ecd41c4b98cc2449e 100644
--- a/base/threading/thread_local_storage.h
+++ b/base/threading/thread_local_storage.h
@@ -98,8 +98,7 @@ class BASE_EXPORT ThreadLocalStorage {
     // Set up the TLS slot.  Called by the constructor.
     // 'destructor' is a pointer to a function to perform per-thread cleanup of
     // this object.  If set to NULL, no cleanup is done for this TLS slot.
-    // Returns false on error.
-    bool Initialize(TLSDestructorFunc destructor);
+    void Initialize(TLSDestructorFunc destructor);
 
     // Free a previously allocated TLS 'slot'.
     // If a destructor was set for this slot, removes