Remove BrowserThread::UnsafeGetMessageLoopForThread()

ios/web/public/web_thread.h

Index: ios/web/public/web_thread.h
diff --git a/ios/web/public/web_thread.h b/ios/web/public/web_thread.h
index d8f395ef0873d33ddf64e97934dae513bdb5437f..56cbb213d7a03e1d52883e40b1f44395e4be0abd 100644
--- a/ios/web/public/web_thread.h
+++ b/ios/web/public/web_thread.h
@@ -174,16 +174,6 @@ class WebThread {
   // perform random blocking operations such as file writes.
   static base::SequencedWorkerPool* GetBlockingPool() WARN_UNUSED_RESULT;
 
-  // Returns a pointer to the thread's message loop, which will become
-  // invalid during shutdown, so you probably shouldn't hold onto it.
-  //
-  // This must not be called before the thread is started, or after
-  // the thread is stopped, or it will DCHECK.
-  //
-  // Ownership remains with the WebThread implementation, so you must not
-  // delete the pointer.
-  static base::MessageLoop* UnsafeGetMessageLoopForThread(ID identifier);
-
   // Callable on any thread.  Returns whether the given well-known thread is
   // initialized.
   static bool IsThreadInitialized(ID identifier) WARN_UNUSED_RESULT;