Introduce RenderProcessHostObserver, use it in its first client.

content/browser/browser_main_loop.cc

 // 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.
 
 #include "content/browser/browser_main_loop.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/file_util.h"
@@ skipping 722 matching lines @@
   TRACE_EVENT0("shutdown", "BrowserMainLoop::ShutdownThreadsAndCleanUp")
 
   // Teardown may start in PostMainMessageLoopRun, and during teardown we
   // need to be able to perform IO.
   base::ThreadRestrictions::SetIOAllowed(true);
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(base::IgnoreResult(&base::ThreadRestrictions::SetIOAllowed),
                  true));
 
-  if (RenderProcessHost::run_renderer_in_process() &&
-      !RenderProcessHost::AllHostsIterator().IsAtEnd()) {
-    delete RenderProcessHost::AllHostsIterator().GetCurrentValue();
-  }
+  if (RenderProcessHost::run_renderer_in_process())
+    RenderProcessHost::ShutDownInProcessRenderer();
 
   if (parts_) {
     TRACE_EVENT0("shutdown",
                  "BrowserMainLoop::Subsystem:PostMainMessageLoopRun");
     parts_->PostMainMessageLoopRun();
   }
 
   trace_memory_controller_.reset();
   system_stats_monitor_.reset();
 
@@ skipping 312 matching lines @@
   if (parameters_.ui_task)
     base::MessageLoopForUI::current()->PostTask(FROM_HERE,
                                                 *parameters_.ui_task);
 
   base::RunLoop run_loop;
   run_loop.Run();
 #endif
 }
 
 }  // namespace content