[DevTools] Move DOM domain overrides to DOMHandler

content/browser/devtools/render_view_devtools_agent_host.cc

Index: content/browser/devtools/render_view_devtools_agent_host.cc
diff --git a/content/browser/devtools/render_view_devtools_agent_host.cc b/content/browser/devtools/render_view_devtools_agent_host.cc
index 62355fae4b7c50b3ae2430046e84c25548c612d2..fa074c192e8511405aff03cc611ee17c7dcbb4cc 100644
--- a/content/browser/devtools/render_view_devtools_agent_host.cc
+++ b/content/browser/devtools/render_view_devtools_agent_host.cc
@@ -110,6 +110,7 @@ void RenderViewDevToolsAgentHost::OnCancelPendingNavigation(
 
 RenderViewDevToolsAgentHost::RenderViewDevToolsAgentHost(RenderViewHost* rvh)
     : render_view_host_(NULL),
+      dom_handler_(new devtools::dom::DOMHandler()),
       input_handler_(new devtools::input::InputHandler()),
       page_handler_(new devtools::page::PageHandler()),
       handler_impl_(new DevToolsProtocolHandlerImpl()),
@@ -118,6 +119,7 @@ RenderViewDevToolsAgentHost::RenderViewDevToolsAgentHost(RenderViewHost* rvh)
           new DevToolsTracingHandler(DevToolsTracingHandler::Renderer)),
       power_handler_(new DevToolsPowerHandler()),
       reattaching_(false) {
+  handler_impl_->SetDOMHandler(dom_handler_.get());
   handler_impl_->SetInputHandler(input_handler_.get());
   handler_impl_->SetPageHandler(page_handler_.get());
   SetRenderViewHost(rvh);
@@ -375,6 +377,7 @@ void RenderViewDevToolsAgentHost::SetRenderViewHost(RenderViewHost* rvh) {
 
   WebContentsObserver::Observe(WebContents::FromRenderViewHost(rvh));
   overrides_handler_->SetRenderViewHost(render_view_host_);
+  dom_handler_->SetRenderViewHost(render_view_host_);
   input_handler_->SetRenderViewHost(render_view_host_);
   page_handler_->SetRenderViewHost(render_view_host_);
 
@@ -390,10 +393,11 @@ void RenderViewDevToolsAgentHost::ClearRenderViewHost() {
       this,
       content::NOTIFICATION_RENDER_WIDGET_VISIBILITY_CHANGED,
       content::Source<RenderWidgetHost>(render_view_host_));
-  render_view_host_ = NULL;
+  render_view_host_ = nullptr;
   overrides_handler_->ClearRenderViewHost();
-  input_handler_->SetRenderViewHost(NULL);
-  page_handler_->SetRenderViewHost(NULL);
+  dom_handler_->SetRenderViewHost(nullptr);
+  input_handler_->SetRenderViewHost(nullptr);
+  page_handler_->SetRenderViewHost(nullptr);
 }
 
 void RenderViewDevToolsAgentHost::DisconnectWebContents() {