We can no longer assume that there is only one process during layout tests

content/shell/browser/webkit_test_controller.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/shell/browser/webkit_test_controller.h"
 
 #include <iostream>
 
 #include "base/base64.h"
 #include "base/command_line.h"
@@ skipping 613 matching lines @@
 
   RenderViewHost* render_view_host =
       main_window_->web_contents()->GetRenderViewHost();
 
   for (std::vector<Shell*>::iterator window = Shell::windows().begin();
        window != Shell::windows().end();
        ++window) {
     WebContents* web_contents = (*window)->web_contents();
     // Only capture the history from windows in the same process as the main
     // window. During layout tests, we only use two processes when an
-    // devtools window is open. This should not happen during history navigation
-    // tests.
+    // devtools window is open.
     if (render_view_host->GetProcess() !=
         web_contents->GetRenderViewHost()->GetProcess()) {
-      NOTREACHED();
       continue;
     }
     routing_ids.push_back(web_contents->GetRenderViewHost()->GetRoutingID());
     current_entry_indexes.push_back(
         web_contents->GetController().GetCurrentEntryIndex());
     std::vector<PageState> history;
     for (int entry = 0; entry < web_contents->GetController().GetEntryCount();
          ++entry) {
       PageState state = web_contents->GetController().GetEntryAtIndex(entry)->
           GetPageState();
@@ skipping 49 matching lines @@
 
   printer_->AddErrorMessage(
       base::StringPrintf("#LEAK - renderer pid %d (%s)", current_pid_,
                          result.detail.c_str()));
   CHECK(!crash_when_leak_found_);
 
   DiscardMainWindow();
 }
 
 }  // namespace content