Don't allow a renderer to exit if we are using it in other views.

content/browser/renderer_host/render_process_host_impl.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_
 #pragma once
 
 #include <map>
 #include <queue>
@@ skipping 133 matching lines @@
   bool deleting_soon_;
 
   // The count of currently swapped out but pending RenderViews.  We have
   // started to swap these in, so the renderer process should not exit if
   // this count is non-zero.
   int32 pending_views_;
 
  private:
   friend class VisitRelayingRenderProcessHost;
 
+  FRIEND_TEST_ALL_PREFIXES(RenderProcessHostTest, DontPutNTPInDyingProcess);
+
   // Creates and adds the IO thread message filters.
   void CreateMessageFilters();
 
   // Control message handlers.
   void OnShutdownRequest();
   void OnDumpHandlesDone();
   void SuddenTerminationChanged(bool enabled);
   void OnUserMetricsRecordAction(const std::string& action);
   void OnRevealFolderInOS(const FilePath& path);
   void OnSavedPageAsMHTML(int job_id, int64 mhtml_file_size);
@@ skipping 94 matching lines @@
   // filtering for this at the render widget level.
   bool ignore_input_events_;
 
   // Records the last time we regarded the child process active.
   base::TimeTicks child_process_activity_time_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderProcessHostImpl);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_BROWSER_RENDER_PROCESS_HOST_IMPL_H_