Don't process messages sent to dead routing ids.

content/test/test_render_frame_host.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/test/test_render_frame_host.h"
 
 #include "content/browser/frame_host/frame_tree.h"
 #include "content/browser/frame_host/navigation_handle_impl.h"
 #include "content/browser/frame_host/navigation_request.h"
 #include "content/browser/frame_host/navigator.h"
@@ skipping 57 matching lines @@
   return static_cast<TestRenderViewHost*>(
       RenderFrameHostImpl::GetRenderViewHost());
 }
 
 MockRenderProcessHost* TestRenderFrameHost::GetProcess() {
   return static_cast<MockRenderProcessHost*>(RenderFrameHostImpl::GetProcess());
 }
 
 void TestRenderFrameHost::InitializeRenderFrameIfNeeded() {
   if (!render_view_host()->IsRenderViewLive()) {
+    render_view_host()->GetProcess()->Init();

[nasko, 2016/01/21 17:50:19]

Why do we need to call through render_view_host()? There is a GetProcess() on
the RFH and it should return the same one.

[ncarter (slow), 2016/01/26 23:08:21]

Sure, but this is here to prevent a DCHECK failure in the RVH call on the line
below.

     RenderViewHostTester::For(render_view_host())->CreateTestRenderView(
         base::string16(), MSG_ROUTING_NONE, MSG_ROUTING_NONE, -1, false);
   }
 }
 
 TestRenderFrameHost* TestRenderFrameHost::AppendChild(
     const std::string& frame_name) {
   OnCreateChildFrame(GetProcess()->GetNextRoutingID(),
                      blink::WebTreeScopeType::Document, frame_name,
                      blink::WebSandboxFlags::None,
@@ skipping 316 matching lines @@
   // cleared during DidFailProvisionalLoad).
   int page_id = entry ? entry->GetPageID() : -1;
   if (page_id == -1) {
     WebContentsImpl* web_contents = static_cast<WebContentsImpl*>(delegate());
     page_id = web_contents->GetMaxPageIDForSiteInstance(GetSiteInstance()) + 1;
   }
   return page_id;
 }
 
 }  // namespace content