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 0acf00e95ff87db52eb55aaea3f4f5a51e42883b..e431421a72c20a191c481937e3edf4bf53965773 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -1104,9 +1104,7 @@ 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(