Enable async upload egl with mailbox synchronizer

gpu/command_buffer/service/async_pixel_transfer_manager_android.cc

Index: gpu/command_buffer/service/async_pixel_transfer_manager_android.cc
diff --git a/gpu/command_buffer/service/async_pixel_transfer_manager_android.cc b/gpu/command_buffer/service/async_pixel_transfer_manager_android.cc
index 618bd0e9538101f613296036c8edcffa73b7b19d..ba1ad2e41936d65636c4801e5a86c8bf8c9644ff 100644
--- a/gpu/command_buffer/service/async_pixel_transfer_manager_android.cc
+++ b/gpu/command_buffer/service/async_pixel_transfer_manager_android.cc
@@ -10,7 +10,6 @@
 #include "gpu/command_buffer/service/async_pixel_transfer_manager_idle.h"
 #include "gpu/command_buffer/service/async_pixel_transfer_manager_stub.h"
 #include "gpu/command_buffer/service/async_pixel_transfer_manager_sync.h"
-#include "gpu/command_buffer/service/mailbox_synchronizer.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_implementation.h"
 
@@ -64,8 +63,7 @@ AsyncPixelTransferManager* AsyncPixelTransferManager::Create(
           !IsBroadcom() &&
           !IsImagination() &&
           !IsNvidia31() &&
-          !base::SysInfo::IsLowEndDevice() &&
-          !gles2::MailboxSynchronizer::GetInstance()) {
+          !base::SysInfo::IsLowEndDevice()) {
         return new AsyncPixelTransferManagerEGL;
       }
       return new AsyncPixelTransferManagerIdle;