Fix data race in RenderThreadImplBrowserTest

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index b62a03139265e6689af06e13acf6bdcfa257f4a9..e3aee0fd6f46bee0e35485858d28fcbd722ddfcf 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -600,7 +600,7 @@ void RenderThreadImpl::SetRenderMessageFilterForTesting(
 RenderThreadImpl::RenderThreadImpl(
     const InProcessChildThreadParams& params,
     std::unique_ptr<blink::scheduler::RendererScheduler> scheduler,
-    scoped_refptr<base::SingleThreadTaskRunner>& resource_task_queue)
+    const scoped_refptr<base::SingleThreadTaskRunner>& resource_task_queue)
     : ChildThreadImpl(Options::Builder()
                           .InBrowserProcess(params)
                           .AutoStartServiceManagerConnection(false)
@@ -636,7 +636,7 @@ RenderThreadImpl::RenderThreadImpl(
 }
 
 void RenderThreadImpl::Init(
-    scoped_refptr<base::SingleThreadTaskRunner>& resource_task_queue) {
+    const scoped_refptr<base::SingleThreadTaskRunner>& resource_task_queue) {
   TRACE_EVENT0("startup", "RenderThreadImpl::Init");
 
   base::trace_event::TraceLog::GetInstance()->SetThreadSortIndex(
@@ -1231,7 +1231,7 @@ void RenderThreadImpl::InitializeCompositorThread() {
 }
 
 void RenderThreadImpl::InitializeWebKit(
-    scoped_refptr<base::SingleThreadTaskRunner>& resource_task_queue) {
+    const scoped_refptr<base::SingleThreadTaskRunner>& resource_task_queue) {
   DCHECK(!blink_platform_impl_);
 
   const base::CommandLine& command_line =