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

base/tracked_objects.h

Index: base/tracked_objects.h
diff --git a/base/tracked_objects.h b/base/tracked_objects.h
index cd69fb7e008115028e4ae9583e828bf9524557ff..e751ba67c94e6ce466923db7df97f440ee0dd169 100644
--- a/base/tracked_objects.h
+++ b/base/tracked_objects.h
@@ -497,14 +497,13 @@ class BASE_EXPORT ThreadData {
   const std::string& thread_name() const { return thread_name_; }
 
   // Initializes all statics if needed (this initialization call should be made
-  // while we are single threaded).  Returns false if unable to initialize.
-  static bool Initialize();
+  // while we are single threaded).
+  static void Initialize();
 
   // Sets internal status_.
   // If |status| is false, then status_ is set to DEACTIVATED.
   // If |status| is true, then status_ is set to PROFILING_ACTIVE.
-  // If it fails to initialize the TLS slot, this function will return false.
-  static bool InitializeAndSetTrackingStatus(Status status);
+  static void InitializeAndSetTrackingStatus(Status status);
 
   static Status status();