Don't set up an autorelease pool in ContentMainRunner on iOS

content/app/content_main_runner.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/app/content_main_runner.h"
 
 #include <stdlib.h>
 
 #include "base/allocator/allocator_extension.h"
 #include "base/at_exit.h"
@@ skipping 560 matching lines @@
     // TRACE_EVENT methods on Linux or iOS builds till after we set this up.
 #if !defined(OS_ANDROID) && !defined(OS_IOS)
     if (!ui_task_) {
       // When running browser tests, don't create a second AtExitManager as that
       // interfers with shutdown when objects created before ContentMain is
       // called are destructed when it returns.
       exit_manager_.reset(new base::AtExitManager);
     }
 #endif  // !OS_ANDROID && !OS_IOS
 
-#if defined(OS_MACOSX)
+    // Don't create this loop on iOS, since the outer loop is already handled
+    // and a loop that's destroyed in shutdown interleaves badly with the event
+    // loop pool on iOS.
+#if defined(OS_MACOSX) && !defined(OS_IOS)
     // We need this pool for all the objects created before we get to the
     // event loop, but we don't want to leave them hanging around until the
     // app quits. Each "main" needs to flush this pool right before it goes into
     // its main event loop to get rid of the cruft.
     autorelease_pool_.reset(new base::mac::ScopedNSAutoreleasePool());
 #endif
 
     // On Android, the command line is initialized when library is loaded and
     // we have already started our TRACE_EVENT0.
 #if !defined(OS_ANDROID)
@@ skipping 223 matching lines @@
 
       delegate_->ProcessExiting(process_type);
     }
 
 #if defined(OS_WIN)
 #ifdef _CRTDBG_MAP_ALLOC
     _CrtDumpMemoryLeaks();
 #endif  // _CRTDBG_MAP_ALLOC
 #endif  // OS_WIN
 
-#if defined(OS_MACOSX)
+#if defined(OS_MACOSX) && !defined(OS_IOS)
     autorelease_pool_.reset(NULL);
 #endif
 
     exit_manager_.reset(NULL);
 
     delegate_ = NULL;
     is_shutdown_ = true;
   }
 
  private:
@@ skipping 23 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ContentMainRunnerImpl);
 };
 
 // static
 ContentMainRunner* ContentMainRunner::Create() {
   return new ContentMainRunnerImpl();
 }
 
 }  // namespace content