Convert SetContentSettingRules to use mojo, part 1/2.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 204aa6a6ddb5b602fdf51659e66fa5e93c34fb1c..e738ab85686678a364d27bafedf3b8566b3b9843 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -1105,9 +1105,7 @@ void ChromeContentBrowserClient::RenderProcessWillLaunch(
     GetRendererContentSettingRules(
         HostContentSettingsMapFactory::GetForProfile(profile), &rules);
   }
-  // TODO(nigeltao): eliminate this legacy IPC. Instead, add an extra arg to
-  // the rc_interface->SetInitialConfiguration call.
-  host->Send(new ChromeViewMsg_SetContentSettingRules(rules));
+  rc_interface->SetContentSettingRules(rules);
 }
 
 GURL ChromeContentBrowserClient::GetEffectiveURL(