Convert SetContentSettingRules to use mojo, part 2/2.

chrome/renderer/chrome_render_thread_observer.cc

Index: chrome/renderer/chrome_render_thread_observer.cc
diff --git a/chrome/renderer/chrome_render_thread_observer.cc b/chrome/renderer/chrome_render_thread_observer.cc
index 32ed66bac4c4c75127ead53e4fdeea6ac4842ea0..694eee7c27e959bea9fed82a4fa2c73343ff5194 100644
--- a/chrome/renderer/chrome_render_thread_observer.cc
+++ b/chrome/renderer/chrome_render_thread_observer.cc
@@ -238,7 +238,6 @@ bool ChromeRenderThreadObserver::is_incognito_process_ = false;
 ChromeRenderThreadObserver::ChromeRenderThreadObserver()
     : field_trial_syncer_(this),
       visited_link_slave_(new visitedlink::VisitedLinkSlave),
-      renderer_configuration_binding_(this),
       weak_factory_(this) {
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
@@ -295,10 +294,6 @@ bool ChromeRenderThreadObserver::OnControlMessageReceived(
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ChromeRenderThreadObserver, message)
     IPC_MESSAGE_HANDLER(ChromeViewMsg_SetFieldTrialGroup, OnSetFieldTrialGroup)
-    // TODO(nigeltao): delete this handler when all senders of
-    // ChromeViewMsg_SetContentSettingRules have been converted to Mojo.
-    IPC_MESSAGE_HANDLER(ChromeViewMsg_SetContentSettingRules,
-                        SetContentSettingRules)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -308,8 +303,7 @@ void ChromeRenderThreadObserver::OnRenderProcessShutdown() {
   visited_link_slave_.reset();
 
   // Workaround for http://crbug.com/672646
-  if (renderer_configuration_binding_.is_bound())
-    renderer_configuration_binding_.Unbind();
+  renderer_configuration_bindings_.CloseAllBindings();
 }
 
 void ChromeRenderThreadObserver::OnFieldTrialGroupFinalized(
@@ -333,8 +327,7 @@ void ChromeRenderThreadObserver::SetContentSettingRules(
 
 void ChromeRenderThreadObserver::OnRendererConfigurationAssociatedRequest(
     chrome::mojom::RendererConfigurationAssociatedRequest request) {
-  DCHECK(!renderer_configuration_binding_.is_bound());
-  renderer_configuration_binding_.Bind(std::move(request));
+  renderer_configuration_bindings_.AddBinding(this, std::move(request));
 }
 
 void ChromeRenderThreadObserver::OnSetFieldTrialGroup(