Create and use BlinkInterfaceProvider WeakPtrs on the same thread

content/renderer/mojo/blink_interface_provider_impl.cc

Index: content/renderer/mojo/blink_interface_provider_impl.cc
diff --git a/content/renderer/mojo/blink_interface_provider_impl.cc b/content/renderer/mojo/blink_interface_provider_impl.cc
index e6df27d475df0e65fbf0004bbfdc13aee4a03cf1..f2e3cd76520fa34582e371514f5d09d202e764cd 100644
--- a/content/renderer/mojo/blink_interface_provider_impl.cc
+++ b/content/renderer/mojo/blink_interface_provider_impl.cc
@@ -17,7 +17,9 @@ 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;
 
@@ -27,8 +29,7 @@ void BlinkInterfaceProviderImpl::getInterface(
   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;
   }