Consolidate all TDI SiteInstances into one render process.

content/public/test/mock_render_process_host.cc

Index: content/public/test/mock_render_process_host.cc
diff --git a/content/public/test/mock_render_process_host.cc b/content/public/test/mock_render_process_host.cc
index 1d87a48ad2aaad174b1c5963fa088021616a0839..c7ba2ecffe885cae6e11af745db182cf841ca86b 100644
--- a/content/public/test/mock_render_process_host.cc
+++ b/content/public/test/mock_render_process_host.cc
@@ -315,6 +315,14 @@ mojom::Renderer* MockRenderProcessHost::GetRendererInterface() {
   return renderer_interface_->get();
 }
 
+void MockRenderProcessHost::SetIsNeverSuitableForReuse() {
+  NOTREACHED();
+}
+
+bool MockRenderProcessHost::MayReuseHost() {
+  return true;
+}
+
 void MockRenderProcessHost::FilterURL(bool empty_allowed, GURL* url) {
   RenderProcessHostImpl::FilterURL(this, empty_allowed, url);
 }