A couple comment updates

base/threading/thread.h

Index: base/threading/thread.h
diff --git a/base/threading/thread.h b/base/threading/thread.h
index 535edd2fd0eb93702785594ac0004b9e53f91da7..7ba38927b750363b7ac06e31875c61e8937807fe 100644
--- a/base/threading/thread.h
+++ b/base/threading/thread.h
@@ -122,7 +122,7 @@ class BASE_EXPORT Thread : PlatformThread::Delegate {
     return message_loop_->message_loop_proxy();
   }
 
-  // Set the name of this thread (for display in debugger too).
+  // Returns the name of this thread (for display in debugger too).
   const std::string &thread_name() { return name_; }
 
   // The native thread handle.