Revert of OOPIF: Specify previous sibling frames when creating new RenderFrames.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 8b1c15323e230682df1c85646f28f0e5b01ad9b1..1ede182290c70954e15ed65404aa397303daab36 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -564,7 +564,6 @@
 void RenderFrameImpl::CreateFrame(
     int routing_id,
     int parent_routing_id,
-    int previous_sibling_routing_id,
     int proxy_routing_id,
     const FrameReplicationState& replicated_state,
     CompositorDependencies* compositor_deps,
@@ -584,19 +583,12 @@
     CHECK(parent_proxy);
     blink::WebRemoteFrame* parent_web_frame = parent_proxy->web_frame();
 
-    blink::WebFrame* previous_sibling_web_frame = nullptr;
-    RenderFrameProxy* previous_sibling_proxy =
-        RenderFrameProxy::FromRoutingID(previous_sibling_routing_id);
-    if (previous_sibling_proxy)
-      previous_sibling_web_frame = previous_sibling_proxy->web_frame();
-
     // Create the RenderFrame and WebLocalFrame, linking the two.
     render_frame =
         RenderFrameImpl::Create(parent_proxy->render_view(), routing_id);
     web_frame = parent_web_frame->createLocalChild(
         WebString::fromUTF8(replicated_state.name),
-        ContentToWebSandboxFlags(replicated_state.sandbox_flags), render_frame,
-        previous_sibling_web_frame);
+        ContentToWebSandboxFlags(replicated_state.sandbox_flags), render_frame);
   } else {
     RenderFrameProxy* proxy =
         RenderFrameProxy::FromRoutingID(proxy_routing_id);