Create and use BlinkInterfaceProvider WeakPtrs on the same thread

content/renderer/mojo/blink_interface_provider_impl.cc

 // Copyright 2016 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/renderer/mojo/blink_interface_provider_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "services/shell/public/cpp/interface_provider.h"
 
 namespace content {
 
 BlinkInterfaceProviderImpl::BlinkInterfaceProviderImpl(
     base::WeakPtr<shell::InterfaceProvider> remote_interfaces)
     : remote_interfaces_(remote_interfaces),
       main_thread_task_runner_(base::ThreadTaskRunnerHandle::Get()),
-      weak_ptr_factory_(this) {}
+      weak_ptr_factory_(this) {
+  weak_ptr_ = weak_ptr_factory_.GetWeakPtr();
+}
 
 BlinkInterfaceProviderImpl::~BlinkInterfaceProviderImpl() = default;
 
 void BlinkInterfaceProviderImpl::getInterface(
     const char* name,
     mojo::ScopedMessagePipeHandle handle) {
   if (!main_thread_task_runner_->BelongsToCurrentThread()) {
     main_thread_task_runner_->PostTask(
         FROM_HERE, base::Bind(&BlinkInterfaceProviderImpl::getInterface,
-                              weak_ptr_factory_.GetWeakPtr(), name,
-                              base::Passed(&handle)));
+                              weak_ptr_, name, base::Passed(&handle)));
     return;
   }
 
   if (!remote_interfaces_)
     return;
 
   remote_interfaces_->GetInterface(name, std::move(handle));
 }
 
 }  // namespace content