Remove all remaining traces of MessageLoopProxy.

content/browser/storage_partition_impl_map.cc

Index: content/browser/storage_partition_impl_map.cc
diff --git a/content/browser/storage_partition_impl_map.cc b/content/browser/storage_partition_impl_map.cc
index ba0c00561bcdc2bf41976a887a66698cf6a1c042..ae72484baa8bb20a79a4d7abe761e0ea4461db46 100644
--- a/content/browser/storage_partition_impl_map.cc
+++ b/content/browser/storage_partition_impl_map.cc
@@ -82,10 +82,8 @@ class BlobProtocolHandler : public net::URLRequestJobFactory::ProtocolHandler {
       // the main thread but we want blob_protocol_handler_ constructed
       // on the IO thread.
       blob_protocol_handler_.reset(new storage::BlobProtocolHandler(
-          blob_storage_context_->context(),
-          file_system_context_.get(),
-          BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE)
-              .get()));
+          blob_storage_context_->context(), file_system_context_.get(),
+          BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE).get()));
     }
     return blob_protocol_handler_->MaybeCreateJob(request, network_delegate);
   }