[DevTools] Fix DCHECK related to DevTools agent state callbacks.

content/browser/devtools/render_view_devtools_agent_host.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/devtools/render_view_devtools_agent_host.h"
 
 #include "base/basictypes.h"
 #include "base/lazy_instance.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/browser/devtools/devtools_manager_impl.h"
@@ skipping 190 matching lines @@
 }
 
 void RenderViewDevToolsAgentHost::OnClientDetached() {
 #if defined(OS_ANDROID)
   power_save_blocker_.reset();
 #endif
   overrides_handler_->OnClientDetached();
   tracing_handler_->OnClientDetached();
   power_handler_->OnClientDetached();
   ClientDetachedFromRenderer();
+
+  // TODO(kaznacheev): Move this call back to DevToolsManagerImpl when
+  // extensions::ProcessManager no longer relies on this notification.
+  if (!reattaching_)
+    DevToolsManagerImpl::GetInstance()->NotifyObservers(this, false);
 }
 
 void RenderViewDevToolsAgentHost::ClientDetachedFromRenderer() {
   if (!render_view_host_)
     return;
 
   InnerClientDetachedFromRenderer();
-
-  // TODO(kaznacheev): Move this call back to DevToolsManagerImpl when
-  // extensions::ProcessManager no longer relies on this notification.
-  if (!reattaching_)
-    DevToolsManagerImpl::GetInstance()->NotifyObservers(this, false);
 }
 
 void RenderViewDevToolsAgentHost::InnerClientDetachedFromRenderer() {
   bool process_has_agents = false;
   RenderProcessHost* render_process_host = render_view_host_->GetProcess();
   for (Instances::iterator it = g_instances.Get().begin();
        it != g_instances.Get().end(); ++it) {
     if (*it == this || !(*it)->IsAttached())
       continue;
     RenderViewHost* rvh = (*it)->render_view_host_;
@@ skipping 212 matching lines @@
       DevToolsProtocol::ParseNotification(message);
 
   if (notification) {
     tracing_handler_->HandleNotification(notification);
   }
   DevToolsManagerImpl::GetInstance()->DispatchOnInspectorFrontend(
       this, message);
 }
 
 }  // namespace content