Revert "DevTools: remove obsolete methods from DevToolsClientHost"

content/browser/debugger/devtools_client_host.cc

 // Copyright (c) 2011 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 <algorithm>
+
+#include "base/lazy_instance.h"
+#include "base/logging.h"
 #include "content/browser/debugger/devtools_client_host.h"
-
 #include "content/browser/debugger/devtools_manager.h"
 
+typedef std::vector<DevToolsClientHost*> DevToolsClientHostList;
+namespace {
+base::LazyInstance<DevToolsClientHostList,
+                   base::LeakyLazyInstanceTraits<DevToolsClientHostList> >
+     g_instances = LAZY_INSTANCE_INITIALIZER;
+}  // namespace
+
+// static
+DevToolsClientHost* DevToolsClientHost::FindOwnerClientHost(
+    RenderViewHost* client_rvh) {
+  for (DevToolsClientHostList::iterator it = g_instances.Get().begin();
+       it != g_instances.Get().end(); ++it) {
+    if ((*it)->GetClientRenderViewHost() == client_rvh)
+      return *it;
+  }
+  return NULL;
+}
+
 DevToolsClientHost::~DevToolsClientHost() {
+  DevToolsClientHostList::iterator it = std::find(g_instances.Get().begin(),
+                                                  g_instances.Get().end(),
+                                                  this);
+  DCHECK(it != g_instances.Get().end());
+  g_instances.Get().erase(it);
+}
+
+RenderViewHost* DevToolsClientHost::GetClientRenderViewHost() {
+  return NULL;
 }
 
 DevToolsClientHost::DevToolsClientHost() : close_listener_(NULL) {
+  g_instances.Get().push_back(this);
 }
 
 void DevToolsClientHost::ForwardToDevToolsAgent(const IPC::Message& message) {
   DevToolsManager::GetInstance()->ForwardToDevToolsAgent(this, message);
 }
 
 void DevToolsClientHost::NotifyCloseListener() {
   if (close_listener_) {
     close_listener_->ClientHostClosing(this);
     close_listener_ = NULL;
   }
 }